Don't immediately exit when no ROMs present

- Re-render modal popup on refresh and wait for more input

src/menu.c

@@ -242,7 +242,7 @@ char* run_main_menu(menu_state* state, nese_Components* comp,
             if (current >= 0) menu.cursor = current;
         }
 
-        // Don't let window refreshes interrupt us.
+        // Don't let window refreshes interrupt us (??? How)
         int status = run_menu(&menu, &files, 20, comp, cart);
 
         if (input_Result_Quit == status) {
@@ -335,9 +335,15 @@ int modal_popup(const char* message, nese_Components* comp,
     if (x < 5) x = 5;
     if (y < 5) y = 5;
 
-    nes_draw_last_frame(comp->rend, NULL != cart->file);
-    nes_draw_text(comp->rend, message, x, y, color_error);
-    nes_draw_done(comp->rend);
 
-    return wait_for_input(comp);
+    int status = (input_Result_Refresh << 8);
+    while (input_Result_Refresh == (status >> 8)) {
+        nes_draw_last_frame(comp->rend, NULL != cart->file);
+        nes_draw_text(comp->rend, message, x, y, color_error);
+        nes_draw_done(comp->rend);
+
+        status = wait_for_input(comp);
+    }
+
+    return status;
 }