Attempt to remove Summary from differencial template

src/applications/differential/conduit/DifferentialGetCommitMessageConduitAPIMethod.php

@@ -117,6 +117,9 @@ final class DifferentialGetCommitMessageConduitAPIMethod
 
       if (!strlen($value)) {
         if ($is_template) {
+          if ($field_key === 'differential:summary') {
+            continue;
+          }
           $commit_message[] = $label.': ';
         }
       } else {