remove redundant else and use strict check

Author: AydinHassan

app/code/Magento/Catalog/Model/Product/Attribute/Backend/Media/ImageEntryConverter.php

@@ -100,16 +100,15 @@ public function convertFrom(ProductAttributeMediaGalleryEntryInterface $entry)
     protected function convertFromMediaGalleryEntryContentInterface(
         ImageContentInterface $content = null
     ) {
-        if ($content == null) {
+        if ($content === null) {
             return null;
-        } else {
-            return [
-                'data' => [
-                    ImageContentInterface::BASE64_ENCODED_DATA => $content->getBase64EncodedData(),
-                    ImageContentInterface::TYPE => $content->getType(),
-                    ImageContentInterface::NAME => $content->getName(),
-                ],
-            ];
-        }
+        } 
+        return [
+            'data' => [
+                ImageContentInterface::BASE64_ENCODED_DATA => $content->getBase64EncodedData(),
+                ImageContentInterface::TYPE => $content->getType(),
+                ImageContentInterface::NAME => $content->getName(),
+            ],
+        ];
     }
 }