inotify: raise QueryFailed when the server crash

When the server crashes, it does not write back on the socket. The message
which is then read from the socket is '', which raises a TypeError.
Catching TypeError to raise QueryFailed instead.

hgext/inotify/client.py

@@ -91,7 +91,13 b' class client(object):'
         Raises QueryFailed on error
         """
         cs = common.recvcs(self.sock)
-        version = ord(cs.read(1))
+        try:
+            version = ord(cs.read(1))
+        except TypeError:
+            # empty answer, assume the server crashed
+            self.ui.warn(_('received empty answer from inotify server'))
+            raise QueryFailed('server crashed')
+
         if version != common.version:
             self.ui.warn(_('(inotify: received response from incompatible '
                       'server version %d)\n') % version)