don't try to get new messages when we get idle response if we're no longer connected, patch by ere, r/sr=me, a=chofmann 239802

mailnews/imap/src/nsImapProtocol.cpp

@@ -1206,8 +1206,8 @@ void nsImapProtocol::HandleIdleResponses()
   //  We might check that something actually changed, but for now we can
   // just assume it. OnNewIdleMessages must run a url, so that
   // we'll go back into asyncwait mode.
-  m_imapMailFolderSink->OnNewIdleMessages();
-
+  if (GetServerStateParser().Connected())
+    m_imapMailFolderSink->OnNewIdleMessages();
 }
 
 void nsImapProtocol::EstablishServerConnection()