fix trimming json on parse

src/zen_parse.c

@@ -134,11 +134,12 @@ static int lua_unserialize_json(lua_State* L) {
 	in = luaL_checklstring(L, 1, &size);
 	p = (char*)in;
 	while (size && isspace(*p) ) { size--; p++; } // first char
+	while (size && (*p == 0x0) ) { size--; p++; } // first char
 	if(!size) {	lua_pushnil(L);	return 1; }
 	if (*p == '{' || *p == '[') {
 		level++;
 	} else {
-		func(L, "JSON doesn't starts with '{', char found: %c", *p);
+		func(L, "JSON doesn't starts with '{', char found: %c (%02x)", *p, *p);
 		lua_pushnil(L);
 		return 1;
 	} // ok, level is 1