Try to prevent transwhat from crashing on malformed protobuf

Spectrum2/backend.py

@@ -4,6 +4,7 @@ import struct
 import sys
 import os
 
+import logging
 import google.protobuf
 
 def WRAP(MESSAGE, TYPE):
@@ -24,6 +25,7 @@ class SpectrumBackend:
 		self.m_pingReceived = False
 		self.m_data = ""
 		self.m_init_res = 0
+		self.logger = logging.getLogger(self.__class__.__name__)
 
 	def handleMessage(self, user, legacyName, msg, nickname = "", xhtml = "", timestamp = ""):
 		m = protocol_pb2.ConversationMessage()
@@ -349,8 +351,15 @@ class SpectrumBackend:
 
 
 			wrapper = protocol_pb2.WrapperMessage()
-			if (wrapper.ParseFromString(self.m_data[4:]) == False):
+			try:
+				parseFromString = wrapper.ParseFromString(self.m_data[4:])
+			except:
+				parseFromString = True
+				self.logger.error("Parse from String exception")
+
+			if parseFromString == False:
 				self.m_data = self.m_data[expected_size+4:]
+				self.logger.error("Parse from String exception")
 				return
 		
 			self.m_data = self.m_data[4+expected_size:]

session.py

@@ -458,7 +458,7 @@ class Session(YowsupApp):
 			else:
 				room = sender
 				try:
-					group = self.groups[room]
+					group = self.groups[self._lengthenGroupId(room)]
 					self.logger.info("Group Message from %s to %s Groups: %s",
 									 group.nick , group , self.groups)
 					self.backend.handleMessage(