jsonrpc.py: Don't swallow errors in transact_block().

If a server returned an error in response to a request,
transact_block() would ignore it.

Signed-off-by: Ethan Jackson <ethan@nicira.com>

python/ovs/jsonrpc.py

@@ -301,7 +301,10 @@ class Connection(object):
         reply = None
         while not error:
             error, reply = self.recv_block()
-            if reply and reply.type == Message.T_REPLY and reply.id == id_:
+            if (reply
+                and (reply.type == Message.T_REPLY
+                     or reply.type == Message.T_ERROR)
+                and reply.id == id_):
                 break
         return error, reply