Incorrect XML crashes the aviary query server in MRG Grid 2.0

Issue

• Malformed XML crashes the aviary query server
• The crash will produce a stack trace in the QueryServerLog such as:

11/13/12 13:38:21 Setting maximum accepts per cycle 8.
11/13/12 13:38:21 main_init() called
11/13/12 13:38:21 UNSECURE Axis2 HTTP listener activated on port 9091
Stack dump for process 13182 at timestamp 1352831911 (21 frames)
aviary_query_server(dprintf_dump_stack+0x63)[0x4d7fe3]
aviary_query_server[0x510c12]
/lib64/libpthread.so.0[0x3571e0f490]
/usr/lib64/libwso2_wsf.so.0(_ZN7wso2wsf6OMNode12getAxiomNodeEv+0x0)[0x3de2014710]
/var/lib/condor/aviary/services/query/libaviary_query_axis.so(_ZN18AviaryQueryService6invokeEPN7wso2wsf9OMElementEPNS0_14MessageContextE+0x18)[0x7f86e0b47b68]
/usr/lib64/libwsf_cpp_msg_recv.so.0(+0x2a2f)[0x7f86e105fa2f]
/usr/lib64/libaxis2_engine.so.0[0x3de2832581]
/usr/lib64/libaxis2_engine.so.0(axis2_engine_receive+0x246)[0x3de2828b16]
/usr/lib64/libaxis2_engine.so.0(axis2_http_transport_utils_process_http_post_request+0x6d7)[0x3de2857ac7]
/usr/lib64/libaxis2_http_common.so.0(axis2_http_worker_process_request+0x1a64)[0x3de1c0e024]
aviary_query_server(_ZN6aviary4soap17Axis2SoapProvider12invokeWorkerEP15axutil_thread_tPv+0xa8)[0x45b0f8]
aviary_query_server(_ZN6aviary4soap17Axis2SoapProvider14processRequestERSs+0x78)[0x45b638]
aviary_query_server(_Z21HandleTransportSocketP7ServiceP6Stream+0x26)[0x45abc6]
aviary_query_server(_ZN10DaemonCore24CallSocketHandler_workerEibP6Stream+0x285)[0x482755]
aviary_query_server(_ZN10DaemonCore35CallSocketHandler_worker_demarshallEPv+0x1a)[0x482c4a]
aviary_query_server(_ZN13CondorThreads8pool_addEPFvPvES0_PiPKc+0x40)[0x50e810]
aviary_query_server(_ZN10DaemonCore17CallSocketHandlerERib+0x135)[0x4786e5]
aviary_query_server(_ZN10DaemonCore6DriverEv+0x2012)[0x47d3b2]
aviary_query_server(main+0x116b)[0x46bc5b]
/lib64/libc.so.6(__libc_start_main+0xfd)[0x357161ecdd]
aviary_query_server[0x45a3e9]