Resolve odd blank-slate error

What does this MR do?

After upgrading my Postgres setup for the GDK, my local instance somehow ended up in a state where an error occurred because of last_pipeline being nil. This should have been a fresh database with the latest, freshly-added seed data, so in theory this could happen to others too. This MR seems to resolve the issue.

The error raised is:

undefined method `detailed_status' for nil:NilClass

on line 72 in app/views/shared/projects/_project.html.haml.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
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• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
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