If parsing fails on body after succeeding on head, return the

partially-parsed packet as part of the error.

aprslib/parsing/__init__.py

@@ -117,6 +117,7 @@ def parse(packet):
     # capture ParseErrors and attach the packet
     except (UnknownFormat, ParseError) as exp:
         exp.packet = packet
+        exp.parsed = parsed
         raise
 
     # if we fail all attempts to parse, try beacon packet