Fix InvalidParameterError handling

otr.py

@@ -147,7 +147,8 @@ class OTR(context.Account):
             text, tlvs = channel.receiveMessage(msgtxt.encode(),appdata=stanza.getThread()) or b''
         except (context.UnencryptedMessage,context.NotEncryptedError,context.ErrorReceived,crypt.InvalidParameterError) as e:
             self.log.error("** got exception while decrypting message: %s" % e)
-            channel.printl(OTR.STATUS[e].format(msg=msgtxt,err=e.args[0].error))
+            status = OTR.STATUS[e.__class__]
+            channel.printl(status.format(msg=msgtxt,err=e.args[0].error) if len(e.args) > 0 and hasattr(e.args[0], 'error') else status)
         else:
             channel.resource = sFrom.resource
             stanza.setBody(text and text.decode() or "")
@@ -169,7 +170,7 @@ class OTR(context.Account):
             message = (encrypted != self.getDefaultQueryMessage(OTR.DEFAULT_POLICY.get)) and event.message or "" 
         except context.NotEncryptedError as e:
             self.log.error("** got exception while encrypting message: %s" % e)
-            channel.printl(peer,OTR.STATUS[e])
+            channel.printl(peer,OTR.STATUS[e.__class__])
         else:
             event.msg_iq.setBody(encrypted.decode()) # encrypted data goes here 
             event.message = message  # message that will be displayed in our chat goes here

plugin-manifest.json

@@ -17,5 +17,5 @@
     "gajim>=1.6,<1.9"
   ],
   "short_name": "otrplugin",
-  "version": "0.5.2"
+  "version": "0.5.3"
 }