Missing telemetry objects cannot be removed from display layouts

[akhenry]

Summary

If a telemetry object is missing from a display layout due to a dictionary change it cannot be removed from the display layout itself. As a workaround, it can be removed from the tree.

Expected vs Current Behavior

You should be able to remove a missing telemetry object from a display layout by selecting it and clicking on the trash can icon in the toolbar.

The problem appears to be because you cannot select a missing object. See screen recoring -

https://github.com/nasa/openmct/assets/4215777/56cea689-f1b2-43f9-a499-0d7a24f89f0e

Steps to Reproduce

1. Import e2e real-time test layout (1).json
2. Navigate to the imported "e2e real-time test layout"
3. Click on a missing alphanumeric telemetry object
4. Observe that the trashcan is not available from the toolbar, and thus the object cannot be removed.

Impact Check List

• [ ] Data loss or misrepresented data?
• [x] Regression? Did this used to work or has it always been broken?
• [x] Is there a workaround available?
• [x] Does this impact a critical component?
• [ ] Is this just a visual bug with no functional impact?
• [ ] Does this block the execution of e2e tests?
• [ ] Does this have an impact on Performance?

Additional Information

[charlesh88]

@akhenry Ran into this during Build 9 MMOC dry run today. This is a definite blocker IMO as users cannot edit their displays to remove deprecated parameters.