Check filename argument in dofile/dofilex.

pdlua.c

@@ -2260,6 +2260,7 @@ static int pdlua_dofilex(lua_State *L)
         if (c)
         {
             filename = luaL_optstring(L, 2, NULL);
+            if (!filename) return 0;
             fd = trytoopenone(c->c_externdir->s_name, filename, "",
               buf, &ptr, MAXPDSTRING, 1);
             if (fd >= 0)
@@ -2331,6 +2332,7 @@ static int pdlua_dofile(lua_State *L)
         if (o)
         {
             filename = luaL_optstring(L, 2, NULL);
+            if (!filename) return 0;
             fd = canvas_open(o->canvas, filename, "", buf, &ptr, MAXPDSTRING, 1);
             if (fd >= 0)
             {

pdlua/tutorial/examples/pdx.lua

@@ -74,7 +74,7 @@ end
 -- present this only recognizes the "reload" message and checks the class
 -- name, if given.
 local function pdluax(self, sel, atoms)
-   if sel == "reload" then
+   if sel == "reload" and not string.match(self._scriptname, ".pd_luax$") then
       -- reload message, check that any extra argument matches the class name
       if atoms[1] == nil or atoms[1] == self._name then
          -- invoke the prereload method if it exists