Null check for annotation value providers necessary for refactoring.

Konstantin Blaschkerequested to merge
4355 into master

Null check for annotation value providers necessary for refactoring.

Necessary for refactoring of annotation set for all ModelElements. Issue-Ref: 4355 Issue-Url: af3#4355 (closed) Signed-off-by: Konstantin Blaschke blaschke@fortiss.org

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