wapbox core dump

  Hello,

  Looked into core dump I submitted to bugs.kannel.org some
time ago and found the reason why wapbox was coredumping.

  In gw/wml_compiler.c line 601 we search for root element. And
if xmlDocGetRootElement(document); returns NULL we pass it to
string_table_build() and get core dump soon afterwards.

  How to patch Kannel to avoid coredump in such case? Clearly
we have to add:
  if ( node == NULL ) return(-1);

  And also some check for ret value in line 376 where we are calling
parse_document().
  Something else?

  Mindaugas