DEM now presents a warning if the user tries to uninstall an installed Dev Env that requires an unavailable tool image..

[janosmurai]

Type Of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Any modification in the test cases
• Any modification in the documentation

Checklist:

• I have read and followed the contribution guideline.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• All the test cases pass and new modifications in the production code are 100% covered.
• I have made corresponding changes to the documentation.

Related Issue

Closing:
DEM-276

Description

When the user wanted to uninstall an installed Dev Env that required at least
one tool image, which not existed anymore, DEM preseneted a wrong error message
indicating that the missing image is used by a container.
Instead, now DEM shows a warning that the image is not available anymore so
can't be removed and the uninstallation process finishes anyway.

How Has This Been Tested?

Tested on Ubuntu 22.04