4179 Add null check for model element handlers

Relates to af3#4179 (closed)

requested review from @munaro

assigned to @barner

added 1 commit

• 4d6c31f5 - Add null check for model element handlers

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requested review from @bayha and removed review request for @munaro

added 1 commit

• c400e62c - GREEN

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Ready to be merged.

merged

mentioned in commit a2da6848