rhbz: test rhbz_new_bug() return value for errors

Related to rhbz#980228

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
rhbz: test xmlrpc env for errors in abrt_xmlrpc_call_params()

Closes rhbz#980228

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>