luaL_error use replaced with c++ exceptions

src/logic/scripting/lua/libjson.cpp

@@ -18,8 +18,7 @@ static int l_json_stringify(lua_State* L) {
         lua_pushstring(L, string.c_str());
         return 1;
     } else {
-        luaL_error(L, "table expected");
-        return 0;
+        throw std::runtime_error("table expected");
     }
 }