fix: Backport handle when the announce response has no fields

Signed-off-by: Ferenc Géczi <[email protected]>

Author: Ferenc-

instana/agent/host.py

@@ -202,6 +202,10 @@ def announce(self, discovery):
             logger.debug("announce: response is not JSON: (%s)", raw_json)
             return None
 
+        if not hasattr(payload, 'get'):
+            logger.debug("announce: response payload has no fields: (%s)", payload)
+            return None
+
         if not payload.get('pid'):
             logger.debug("announce: response payload has no pid: (%s)", payload)
             return None