Fix for triggering git hooks configured through Project settings.

• We should skip hooks only for new branch.
• The spec was using a wrong rev as the blank rev.

REF: #587 (closed)

cc/ @jameslopez

lib/gitlab/git_access.rb

@@ -211,11 +211,13 @@ module Gitlab
           return build_status_object(true)
         end
+        blank_oldrev = Gitlab::Git.blank_ref?(oldrev)
+
         # if oldrev is blank, the branch was just created
-        oldrev = project.default_branch if Gitlab::Git.blank_ref?(oldrev)
+        oldrev = project.default_branch if blank_oldrev
         commits(newrev, oldrev, project).each do |commit|
-          next if commit_from_annex_sync?(commit.safe_message) || old_commit?(commit)
+          next if commit_from_annex_sync?(commit.safe_message) || (blank_oldrev && old_commit?(commit))
           if status_object = check_commit(commit, git_hook)
             return status_object