Fix dirichlet check cellcheck

[KnutAM]

Fixes the bug #593 introduced by #427

[codecov-commenter]

Codecov Report

Base: 92.79% // Head: 92.79% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (9098453) compared to base (3dd1411).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 9098453 differs from pull request most recent head f5c6ec7. Consider uploading reports for the commit f5c6ec7 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #594   +/-   ##
=======================================
  Coverage   92.79%   92.79%           
=======================================
  Files          28       28           
  Lines        4217     4218    +1     
=======================================
+ Hits         3913     3914    +1     
  Misses        304      304           

Impacted Files	Coverage Δ
src/Dofs/ConstraintHandler.jl	96.06% <100.00%> (+<0.01%)	⬆️

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