Fix: Handle Deleted Files in the Recent List

Handle items in the Open Recent list being unavailable. Keep current
overall behavior, but show "File Not Found" on the tooltip.

Pull Request: https://projects.blender.org/blender/blender/pulls/117139

source/blender/editors/interface/interface_templates.cc

@@ -7203,6 +7203,12 @@ static void uiTemplateRecentFiles_tooltip_func(bContext * /*C*/, uiTooltipData *
   UI_tooltip_text_field_add(tip, BLI_strdup(root), nullptr, UI_TIP_STYLE_HEADER, UI_TIP_LC_NORMAL);
   UI_tooltip_text_field_add(tip, nullptr, nullptr, UI_TIP_STYLE_SPACER, UI_TIP_LC_NORMAL);
 
+  if (!BLI_exists(path)) {
+    UI_tooltip_text_field_add(
+        tip, BLI_strdup(N_("File Not Found")), nullptr, UI_TIP_STYLE_NORMAL, UI_TIP_LC_ALERT);
+    return;
+  }
+
   /* Blender version. */
   char version_st[128] = {0};
   /* Load the thumbnail from cache if existing, but don't create if not. */