Merge branch 'fj-59547-fix-has-commits' into 'master'

Fix MergeRequest#has_commits? nil comparison

Closes #59547

See merge request gitlab-org/gitlab-ce!26828

app/models/merge_request.rb

@@ -1343,7 +1343,7 @@ def keep_around_commit
   end
 
   def has_commits?
-    merge_request_diff && commits_count > 0
+    merge_request_diff && commits_count.to_i > 0
   end
 
   def has_no_commits?

spec/models/merge_request_spec.rb

@@ -2714,14 +2714,21 @@ def create_pipeline(status)
   end
 
   describe '#has_commits?' do
-    before do
+    it 'returns true when merge request diff has commits' do
       allow(subject.merge_request_diff).to receive(:commits_count)
         .and_return(2)
-    end
 
-    it 'returns true when merge request diff has commits' do
       expect(subject.has_commits?).to be_truthy
     end
+
+    context 'when commits_count is nil' do
+      it 'returns false' do
+        allow(subject.merge_request_diff).to receive(:commits_count)
+        .and_return(nil)
+
+        expect(subject.has_commits?).to be_falsey
+      end
+    end
   end
 
   describe '#has_no_commits?' do