Exception on viewing credentials inventory for instances with at least one group access token
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### Summary
<!-- Summarize the bug encountered concisely. -->
500 exception is thrown on viewing [credentials inventory](https://staging.gitlab.com/admin/credentials) for instances that have one or more group access tokens.
### Steps to reproduce
<!-- Describe how one can reproduce the issue - this is very important. Please use an ordered list. -->
1. Create a group.
1. Create group access token as per [steps mentioned in the documentation](https://docs.gitlab.com/ee/user/group/settings/group_access_tokens.html#create-a-group-access-token-using-ui).
1. Navigate to [credentials inventory](https://staging.gitlab.com/admin/credentials).
### Example Project
<!-- If possible, please create an example project here on GitLab.com that exhibits the problematic
behavior, and link to it here in the bug report. If you are using an older version of GitLab, this
will also determine whether the bug is fixed in a more recent version. -->
### What is the current *bug* behavior?
<!-- Describe what actually happens. -->
500 exception is encountered with the following stacktrace
Sentry exception - https://sentry.gitlab.net/gitlab/staginggitlabcom/issues/3203550
<details><summary>Stacktrace</summary>
```log
↳ ee/app/views/shared/credentials_inventory/personal_access_tokens/_personal_access_token.html.haml:32
Rendered collection of ee/app/views/shared/credentials_inventory/personal_access_tokens/_personal_access_token.html.haml [9 times] (Duration: 35.5ms | Allocations: 11404)
Rendered ee/app/views/shared/credentials_inventory/_personal_access_tokens.html.haml (Duration: 41.2ms | Allocations: 14992)
Rendered ee/app/views/shared/credentials_inventory/index.html.haml within layouts/admin (Duration: 49.7ms | Allocations: 23932)
Rendered layout layouts/admin.html.haml (Duration: 49.9ms | Allocations: 23991)
Completed 500 Internal Server Error in 81ms (ActiveRecord: 5.2ms | Elasticsearch: 0.0ms | Allocations: 42562)
NoMethodError - undefined method `id' for nil:NilClass:
ee/app/views/shared/credentials_inventory/personal_access_tokens/_personal_access_token.html.haml:33
ee/app/views/shared/credentials_inventory/_personal_access_tokens.html.haml:9
ee/app/views/shared/credentials_inventory/index.html.haml:21
app/controllers/application_controller.rb:142:in `render'
ee/app/controllers/concerns/credentials_inventory_actions.rb:12:in `block (2 levels) in index'
ee/app/controllers/concerns/credentials_inventory_actions.rb:10:in `index'
ee/lib/gitlab/ip_address_state.rb:10:in `with'
ee/app/controllers/ee/application_controller.rb:45:in `set_current_ip_address'
app/controllers/application_controller.rb:499:in `set_current_admin'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:490:in `set_session_storage'
lib/gitlab/i18n.rb:105:in `with_locale'
lib/gitlab/i18n.rb:111:in `with_user_locale'
app/controllers/application_controller.rb:484:in `set_locale'
app/controllers/application_controller.rb:478:in `set_current_context'
lib/gitlab/metrics/elasticsearch_rack_middleware.rb:16:in `call'
lib/gitlab/middleware/rails_queue_duration.rb:33:in `call'
lib/gitlab/middleware/memory_report.rb:13:in `call'
lib/gitlab/middleware/speedscope.rb:13:in `call'
lib/gitlab/request_profiler/middleware.rb:17:in `call'
lib/gitlab/query_limiting/middleware.rb:17:in `block in call'
lib/gitlab/query_limiting/transaction.rb:40:in `run'
lib/gitlab/query_limiting/middleware.rb:16:in `call'
lib/gitlab/metrics/rack_middleware.rb:16:in `block in call'
lib/gitlab/metrics/web_transaction.rb:46:in `run'
lib/gitlab/metrics/rack_middleware.rb:16:in `call'
lib/gitlab/jira/middleware.rb:19:in `call'
lib/gitlab/middleware/go.rb:20:in `call'
lib/gitlab/etag_caching/middleware.rb:21:in `call'
lib/gitlab/middleware/query_analyzer.rb:11:in `block in call'
lib/gitlab/database/query_analyzer.rb:42:in `within'
lib/gitlab/middleware/query_analyzer.rb:11:in `call'
lib/gitlab/middleware/multipart.rb:173:in `call'
lib/gitlab/middleware/read_only/controller.rb:50:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/same_site_cookies.rb:27:in `call'
lib/gitlab/middleware/handle_malformed_strings.rb:21:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:21:in `call'
lib/gitlab/middleware/webhook_recursion_detection.rb:15:in `call'
config/initializers/fix_local_cache_middleware.rb:11:in `call'
lib/gitlab/middleware/compressed_json.rb:26:in `call'
lib/gitlab/middleware/static.rb:11:in `call'
lib/gitlab/webpack/dev_server_middleware.rb:34:in `perform_request'
lib/gitlab/middleware/rack_multipart_tempfile_factory.rb:19:in `call'
lib/gitlab/middleware/sidekiq_web_static.rb:20:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:77:in `call'
lib/gitlab/middleware/release_env.rb:13:in `call'
```
</details>
### What is the expected *correct* behavior?
<!-- Describe what you should see instead. -->
Credentials inventory should load successfully.
### Relevant logs and/or screenshots
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as it's tough to read otherwise. -->
### Output of checks
<!-- If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com -->
#### Results of GitLab environment info
<!-- Input any relevant GitLab environment information if needed. -->
<details>
<summary>Expand for output related to GitLab environment info</summary>
<pre>
(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)
(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)
</pre>
</details>
#### Results of GitLab application Check
<!-- Input any relevant GitLab application check information if needed. -->
<details>
<summary>Expand for output related to the GitLab application check</summary>
<pre>
(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:check SANITIZE=true`)
(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true`)
(we will only investigate if the tests are passing)
</pre>
</details>
### Possible fixes
<!-- If you can, link to the line of code that might be responsible for the problem. -->
issue
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