Added try-catch block in getSwatchAttributeImage

getSwatchAttributeImage calls generateSwatchVariations($file), which throws an Exception when the file $file does not exist in the file system (see line 189: $image = $this->imageFactory->create($absoluteImagePath), which calls Image->__construct() and then  Image->open, throwing an Exception on !file_exists($file)). This leads to the rest of the page not being rendered, when just one swatch image is missing. Not great. This fixes it and returns an empty file url (could also return the intended one, or a placeholder).

Author: josefbehr

app/code/Magento/Swatches/Helper/Media.php

@@ -109,7 +109,11 @@ public function getSwatchAttributeImage($swatchType, $file)
         $absoluteImagePath = $this->mediaDirectory
             ->getAbsolutePath($this->getSwatchMediaPath() . '/' . $generationPath);
         if (!file_exists($absoluteImagePath)) {
-            $this->generateSwatchVariations($file);
+            try {
+                $this->generateSwatchVariations($file);
+            } catch (\Exception $e) {
+                return '';
+            }
         }
         return $this->getSwatchMediaUrl() . '/' . $generationPath;
     }