Add file check for image upload form widgets - Fixes #3653

modules/backend/formwidgets/MediaFinder.php

@@ -84,8 +84,11 @@ class MediaFinder extends FormWidgetBase
     public function prepareVars()
     {
         $value = $this->getLoadValue();
+        $isImage = $this->mode === 'image';
+
         $this->vars['value'] = $value;
-        $this->vars['imageUrl'] = $value ? MediaLibrary::url($value) : '';
+        $this->vars['imageUrl'] = $isImage && $value ? MediaLibrary::url($value) : '';
+        $this->vars['imageExists'] = $isImage && $value ? MediaLibrary::instance()->exists($value) : '';
         $this->vars['field'] = $this->formField;
         $this->vars['prompt'] = str_replace('%s', '<i class="icon-folder"></i>', trans($this->prompt));
         $this->vars['mode'] = $this->mode;

modules/backend/formwidgets/mediafinder/partials/_image_single.htm

@@ -13,9 +13,13 @@
 
     <!-- Existing value -->
     <div class="find-object">
-        <div class="icon-container">
-            <img data-find-image src="<?= $imageUrl ?>" alt="" />
-        </div>
+        <?php if ($imageExists): ?>
+            <div class="icon-container">
+                <img data-find-image src="<?= $imageUrl ?>" alt="" />
+            </div>
+        <?php else: ?>
+            <p class="help-block"><?= e(trans('backend::lang.mediafinder.no_image')) ?></p>
+        <?php endif ?>
         <div class="info">
             <h4 class="filename">
                 <span data-find-file-name><?= ltrim($value, '/') ?></span>

modules/backend/lang/en/lang.php

@@ -553,7 +553,8 @@ return [
     ],
     'mediafinder' => [
         'label' => 'Media Finder',
-        'default_prompt' => 'Click the %s button to find a media item'
+        'default_prompt' => 'Click the %s button to find a media item',
+        'no_image' => 'The image could not be found'
     ],
     'media' => [
         'menu_label' => 'Media',