Make readline tab-completion work in two-process terminal frontend.

IPython/frontend/terminal/completer.py

@@ -43,7 +43,10 b' class ClientCompleter2p(object):'
            self.matches = []
            print('WARNING: Kernel timeout on tab completion.')
         #print self.matches
-        return self.matches
+	try:
+	    return self.matches[state]
+	except IndexError:
+	    return None
+        
         
         
-        
  No newline at end of file