Allow receival of predicates without args (values)

spade_bdi/bdi.py

@@ -10,6 +10,7 @@ from spade.agent import Agent
 from spade.template import Template
 from spade.message import Message
 import json
+from ast import literal_eval
 
 PERCEPT_TAG = frozenset(
     [pyson.Literal("source", (pyson.Literal("percept"), ))])
@@ -180,8 +181,13 @@ class BDIAgent(Agent):
                     raise pyson.PysonError(
                         "unknown illocutionary force: %s" % ilf_type)
                 intention = pyson.runtime.Intention()
+                args = literal_eval(received["args"])
+
+                if args != tuple():
                     message = pyson.Literal(
-                    received["functor"], tuple([received["args"]]))
+                        received["functor"], args)
+                else:
+                    message = pyson.Literal(received["functor"])
                 message = pyson.freeze(message, intention.scope, {})
                 tagged_message = message.with_annotation(
                     pyson.Literal("source", (pyson.Literal(str(msg.sender)), )))