fix ClonedRepoGitlabPersistence (#4510)

Signed-off-by: Feng Huang <[email protected]>

reconcile/templating/renderer.py

@@ -168,7 +168,7 @@ def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
             raise ValueError("ClonedRepoGitlabPersistence.result not set!")
         self.result.outputs = self.outputs
 
-        if self.dry_run:
+        if self.dry_run or not self.outputs:
             return
 
         self.mr_manager.housekeeping()
@@ -347,6 +347,7 @@ def reconcile(
             )
             with persistence as p:
                 p.result = result
+                p.outputs = []
                 for item in for_each_items:
                     self.reconcile_template_collection(
                         collection=collection,