SIENTIAPDE-1445

Enhance MongoDB activity to handle missing topic configurations gracefully by using get() method and skipping empty collections, improving robustness in pipeline processing.

orchestrator/activities/mongo_db.py

@@ -393,7 +393,9 @@ class MongoDB(SientiaMonitoring):
         created_indexes = []
 
         for _pipeline_name, pipeline_config in pipelines.items():
-            collection = pipeline_config['topic']
+            collection = pipeline_config.get('topic', None)
+            if not collection:
+                continue
 
             try:
                 # Check if collection exists