fix: pulsar ingestion fails when Avro schema is missing namespace or name

Author: Alice

metadata-ingestion/src/datahub/ingestion/source/pulsar.py

@@ -89,7 +89,16 @@ def __init__(self, schema):
             logger.error(f"Invalid JSON schema: {schema_data}. Error: {str(e)}")
             avro_schema = {}
 
-        self.schema_name = avro_schema.get("namespace") + "." + avro_schema.get("name")
+        namespace = avro_schema.get("namespace")
+        name = avro_schema.get("name")
+        if not namespace:
+            logger.warning("namespace is missing in schema, using 'default_namespace'")
+            namespace = "default_namespace"
+        if not name:
+            logger.warning("name is missing in schema, using 'default_name'")
+            name = "default_name"
+        self.schema_name = namespace + "." + name
+
         self.schema_description = avro_schema.get("doc")
         self.schema_type = schema.get("type")
         self.schema_str = schema.get("data")