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ShyLU: Fixing the case of empty blocks.

James Willenbring requested to merge searhein:fix-empty-blocks into develop

Created by: searhein


Description, Motivation and Context

With this, piecewise constant coarse basis functions are automatically introduced in cases when no interface dofs exist. This is important for discretizations with discontinuous basis functions.

How Has This Been Tested?

@chochmuth Please check if this works with our in-house implementation.


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  • My change requires a change to the documentation.
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  • 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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