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[backport/2.6][!366] [LocalMatrix] fix iteration when cols == 0

Steffen Müthing requested to merge cherry-pick-6fb2aa30 into releases/2.6

Merge branch 'feature/check-lfs-size-before-scatter' into 'master'

When the local matrix has 0 columns, the iterators where not set up correctly. This merge request fixes this issue by returning the begin iterator as end iterator in such a case.

See merge request pdelab/dune-pdelab!366

(cherry picked from commit 6fb2aa30)

212ad793 [TestLocalMatrix] add a test for local matrix 9eda6d11 [LocalMatrix] fix corner case of zero columns afec9380 [TestLocalMatrix] remove try catch block

Edited by Steffen Müthing

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