Some minor edge-case fixes when using a session as caller.

evennia/server/serversession.py

@@ -81,7 +81,7 @@ class NAttributeHandler(object):
         """
         return key in self._store
 
-    def get(self, key):
+    def get(self, key, default=None):
         """
         Get the named key value.
 
@@ -92,7 +92,7 @@ class NAttributeHandler(object):
             the value of the Nattribute.
 
         """
-        return self._store.get(key, None)
+        return self._store.get(key, default)
 
     def add(self, key, value):
         """
@@ -376,6 +376,9 @@ class ServerSession(Session):
                 for the protocol(s).
 
         """
+        # this can happen if this is triggered e.g. a command.msg
+        # that auto-adds the session, we'd get a kwarg collision.
+        kwargs.pop("session", None)
         if text is not None:
             self.data_out(text=text, **kwargs)
         else: