Issue #3495851 by grimreaper: Components: check attributes props default value

Closes #3495851

components/card/card.component.yml

@@ -46,17 +46,23 @@ props:
       title: "Row attributes"
       description: "Only for horizontal variant. The attributes to customize the tag with the row class. Default value: g-0"
       $ref: "ui-patterns://attributes"
-      default: "g-0"
+      default:
+        class:
+          - g-0
     image_col_attributes:
       title: "Image column attributes"
       description: "Only for horizontal variant. The attributes to customize the column with the image. Default value: col-md-4"
       $ref: "ui-patterns://attributes"
-      default: "col-md-4"
+      default:
+        class:
+          - col-md-4
     content_col_attributes:
       title: "Content column attributes"
       description: "Only for horizontal variant. The attributes to customize the column with the content. Default value: col-md-8"
       $ref: "ui-patterns://attributes"
-      default: "col-md-8"
+      default:
+        class:
+          - col-md-8
     image_col_classes:
       title: "Image column classes (deprecated)"
       description: "Only for horizontal variant. Deprecated, use 'Image column attributes' instead."