[ejabberd] PATCH: unhandled error message in method ejabberd_auth:is_user_exists

[Eric Liang]

Hi all,
The error occured when I was testing ejabberd:

    =ERROR REPORT==== 2010-05-27 03:46:42 ===
    E(<0.15040.45>:ejabberd_sm:88) : {{case_clause,
                                       {error,
                                        {shutdown,
                                         {p1_fsm,sync_send_event,
                                          [<0.295.0>,
                                           {sql_cmd,
                                            {sql_query,
                                             ["select password from
    users where username='",
                                              "tsung85304","';"]}},
                                           60000]}}}},
                                      [{lists,any,2},
                                       {ejabberd_sm,route_message,3},
                                       {ejabberd_sm,route,3},
                                       {ejabberd_local,route,3},
                                       {ejabberd_router,route,3},
                                      
    {ejabberd_c2s,session_established2,2},
                                       {p1_fsm,handle_msg,10},
                                       {proc_lib,init_p_do_apply,3}]}
    when processing: {{jid,"11232814341274903131613362","XXXXXXXX","tsung",
                          "11232814341274903131613362","XXXXXXXX","tsung"},
                      {jid,"tsung85304","XXXXXXXX",[],"tsung85304",
                          "XXXXXXXX",[]},
                      {xmlelement,"message",
                          [{"id","587275"},{"to","tsung85304 at XXXXXXXX"}],
                          [{xmlelement,"body",[],
                               [{xmlcdata,<<"vtglimieyhemzlxc">>}]}]}}

I checked the codes, it's due to the unhandled error message in method
ejabberd_auth:is_user_exists, so I fixed it and generate the patch(
please see the attatchment ).

This is my first touch on ejabberd, so it's great if one of you would
review it.

Thanks,
Eric
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