Fix broken ZMQ messages

tfw/internals/networking/serialization.py

@@ -42,7 +42,8 @@ def deserialize_tfw_msg(*args):
     """
     Return message from TFW multipart data
     """
-    return _deserialize_all(*args)[1]
+    envelope = _deserialize_all(*args)
+    return _repair_if_needed(envelope)
 
 
 def _serialize_all(*args):
@@ -84,6 +85,18 @@ def _deserialize_single(data):
         return _decode_if_needed(data)
 
 
+def _repair_if_needed(envelope):
+    """
+    Quick fix for broken messages received from separate processes.
+    """
+    if len(envelope) == 2:
+        return envelope[1]
+    for part in envelope:
+        if isinstance(part, dict):
+            return part
+    return {}
+
+
 def _encode_if_needed(value):
     """
     Return input as bytes