Bug fix: Do not close the connection twice.

In writable(), the _send() call could have closed the connection so don't
close it again if aborted or don't disable write events polling has this is
already done.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1697 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/connection.py

@@ -242,7 +242,7 @@ class Connection(BaseConnection):
     def writable(self):
         """Called when self is writable."""
         self._send()
-        if not self.pending():
+        if not self.write_buf and self.connector is not None:
             if self.aborted:
                 self.close()
             else: