Fix DiffCheck failing due to invalid string argument

Hot patch for #55137

Fix DiffCheck failing due to invalid string argument
Hot patch for #55137
eb335bbc · Stan Hu · Douwe Maan · 85f430cb · eb335bbc
Commit eb335bbc authored Dec 10, 2018 by Stan Hu Committed by Douwe Maan Dec 11, 2018
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lib/gitlab/checks/diff_check.rb lib/gitlab/checks/diff_check.rb +1 -0

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--- a/lib/gitlab/checks/diff_check.rb
+++ b/lib/gitlab/checks/diff_check.rb
@@ -11,6 +11,7 @@ module Gitlab
      }.freeze

      def validate!
+        return if deletion? || newrev.nil?
        return unless should_run_diff_validations?
        return if commits.empty?
        return unless uses_raw_delta_validations?