Do not quit when opening an unsupported file

Bug noticed when trying to open an OTF2 trace file while ViTE was built without OTF2 support. It was suddenly exiting ViTE, making it look like a crash.

Now, do not exit ViTE in such case, so the error message can be read by the user.

added 27 commits

• 720563ae...829cdfe1 - 26 commits from branch solverstack:master
• 9096d4d3 - Do not quit when opening an unsupported file

Compare with previous version

enabled an automatic merge when the pipeline for 9096d4d3 succeeds

merged

mentioned in commit 098dc5f6