Fix NoMethodError: Projects::BlobController#update

Vasilii Iakliushinrequested to merge
519905-fix-no-method-error into master

What does this MR do and why?

Contributes to #519905 (closed)

Problem

When user doesn't have permission to push code and branch name is missing, then the server raises an Internal Error.

Solution

Handle the exception and return a regular error.

References

NoMethodError: Projects::BlobController#update ... (#519905 - closed)

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Related to #519905 (closed)

Edited by Vasilii Iakliushin

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