When removing defects from Test Runs in certain situations there is a 500 error.

Description

When removing defects from Test Runs in certain situations there is a 500 error.

When the defect is linked to the Test, Test Execution or Coverable issue linked to the Test, but that link is "on reverse" (on the opposite direction of what is linked automatically, using the same issue link type), it cause the "removing of the defect" to not work.

How to reproduce

1. Create a TestRun
2. Add a defect
3. Create Links in the TestExecution with the linkType "Created by"
4. Delete the Link "Created" (defect) manually from the TestExecution
5. Delete the defect from the TestRun

Actual result/Attachments

Throws an 500 error

Expected result

It should remove the defect from the TestRun