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ShyLU/FROSch: Adding a check for the block coarse map.

James Willenbring requested to merge searhein:fix-#4276 into develop

Created by: searhein


Description, Motivation, and Context

This PR addresses #4276. In particular, I added some checks to make sure that we do not run into assertions in case a block is empty.

@chochmuth, please check if the errors in your code still appear. I am not sure if this covers all your issues. For the FROSch tests, disabling a block seems to works now.

How Has This Been Tested?

All FROSch tests complete successfully on my machine, even if a block is disabled.


  • My commit messages mention the appropriate GitHub issue numbers.
  • My code follows the code style of the affected package(s).
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have read the code contribution guidelines for this project.
  • I have added tests to cover my changes.
  • All new and existing tests passed.
  • No new compiler warnings were introduced.
  • These changes break backwards compatibility.

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