Validate NOT NULL for projects.has_external_wiki and projects.has_external_issue_tracker

About

Invalidated NOT NULL constraints were added to projects.has_external_wiki in !50916 (merged) and projects.has_external_issue_tracker in !51855 (closed).

According to our database migration guide for introducing NOT NULL constraints, we should add a separate validations of the constraints in the following milestone (%13.9).

Solution

Add validations to the NOT NULL constraints on projects.has_external_wiki and projects.has_external_issue_tracker as per our database guide.