Connection lookups invalid data handling

- shouldn't throw an exception if argument is a string rather than Peer

src/network/connectionpool.py

@@ -65,12 +65,18 @@ class BMConnectionPool(object):
     def getConnectionByAddr(self, addr):
         if addr in self.inboundConnections:
             return self.inboundConnections[addr]
+        try:
             if addr.host in self.inboundConnections:
                 return self.inboundConnections[addr.host]
+        except AttributeError:
+            pass
         if addr in self.outboundConnections:
             return self.outboundConnections[addr]
+        try:
             if addr.host in self.udpSockets:
                 return self.udpSockets[addr.host]
+        except AttributeError:
+            pass
         raise KeyError
 
     def isAlreadyConnected(self, nodeid):