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Fix NoMethodError: undefined method `sha'

Vasilii Iakliushin requested to merge 395480_fix_no_method_error into master

What does this MR do and why?

Contributes to #395480 (closed)

Problem

Empty repositories can have an default branch that doesn't point anywhere. Attempt to access their sha will raise a NoMethodError.

Solution

Verify that the default branch points to an existing commit before requesting sha.

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