Added logic to handle missing attributes from the context (#7696)

ingestion/src/metadata/ingestion/api/topology_runner.py

@@ -102,7 +102,25 @@ class TopologyRunnerMixin(Generic[C]):
             if node.post_process:
                 logger.debug(f"Post processing node {node}")
                 for process in node.post_process:
-                    node_post_process = getattr(self, process)
+                    try:
+                        yield from self.check_context_and_handle(process)
+                    except Exception as exc:
+                        logger.debug(traceback.format_exc())
+                        logger.warning(
+                            f"Could not run Post Process `{process}` from Topology Runner -- {exc}"
+                        )
+
+    def check_context_and_handle(self, post_process: str):
+        """Based on the post_process step, check context and
+        evaluate if we can run it based on available class attributes
+
+        Args:
+            post_process: the name of the post_process step
+        """
+        if post_process == "mark_tables_as_deleted" and not self.context.database:
+            raise ValueError("No Database found in  `self.context`")
+
+        node_post_process = getattr(self, post_process)
         for entity_request in node_post_process():
             yield entity_request