BitBucket import stuck/hangs indefinitely
Summary
Something is causing imports from BitBucket to hang indefinitely.
Steps to reproduce
Import a project
Expected behavior
Import successful or fail
Actual behavior
Import is stuck
Relevant logs and/or screenshots
irb(main):004:0> p.import_error
=> "{\"message\":\"The remote data could not be fully imported.\",\"errors\":[{\"type\":\"pull_request\",\"iid\":1,\"errors\":\"undefined method `fetch' for nil:NilClass\"},{\"type\":\"pull_request\",\"iid\":2,\"errors\":\"undefined method `fetch' for nil:NilClass\"}]}"
Results of GitLab environment info
GitLab 8.15