Add default value to "should_create_thumbnails" for backward compatibility.

Author: youchenlee

src/controllers/CropController.php

@@ -49,7 +49,7 @@ public function getCropimage($overWrite = true)
             ->crop($dataWidth, $dataHeight, $dataX, $dataY)
             ->save($crop_path);
 
-        if (config('lfm.should_create_thumbnails')) {
+        if (config('lfm.should_create_thumbnails', true)) {
             // create thumb folder
             parent::createFolderByPath(parent::getThumbPath());
 

src/traits/LfmHelpers.php

@@ -529,7 +529,7 @@ public function fileIsImage($file)
      */
     public function imageShouldHaveThumb($file)
     {
-        if (! config('lfm.should_create_thumbnails')) {
+        if (! config('lfm.should_create_thumbnails', true)) {
             return false;
         }