segfaults are bad

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10386 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_commands/mod_commands.c

@@ -2670,7 +2670,7 @@ SWITCH_STANDARD_API(uuid_setvar_multi_function)
 
 			for (x = 0 ; x < argc; x++) {
 				var_name = argv[x];
-				if ((var_value = strchr(var_name, '='))) {
+				if (var_name && (var_value = strchr(var_name, '='))) {
 					*var_value++ = '\0';
 				}
 				if (switch_strlen_zero(var_name)) {