made twistedutil.protocol 2.4 compatible

eventlet/twistedutil/protocol.py

@@ -185,6 +185,7 @@ class GreenTransport(GreenTransportBase):
         """Read size bytes or until EOF"""
         if self._queue is not None:
             resumed = False
+            try:
                 try:
                     while len(self._buffer) < size or size < 0:
                         if not resumed:
@@ -212,6 +213,7 @@ class GreenTransport(GreenTransportBase):
         """Receive a single chunk of undefined size but no bigger than buflen"""
         if self._queue is not None and not self._buffer:
             self.resumeProducing()
+            try:
                 try:
                     recvd = self._wait()
                     #print 'received %r' % recvd