Optional address in SMS serialize

mvt/android/modules/adb/sms.py

@@ -59,7 +59,7 @@ class SMS(AndroidExtraction):
             "timestamp": record["isodate"],
             "module": self.__class__.__name__,
             "event": f"sms_{record['direction']}",
-            "data": f"{record['address']}: \"{body}\""
+            "data": f"{record.get('address', 'unknown source')}: \"{body}\""
         }
 
     def check_indicators(self) -> None: