ImagesTable: fix grey box under AMI when image build is in progress

Previously a Skeleton component was used as a placeholder for an AMI when the build was still pending.
This removes the Skeleton and returns undefined rendering the AMI as empty.

src/Components/ImagesTable/ClonesTable.tsx

@@ -37,11 +37,8 @@ const Ami = ({ status }: AmiPropTypes) => {
         </ClipboardCopy>
       );
 
-    case 'failure':
-      return undefined;
-
     default:
-      return <Skeleton width="12rem" />;
+      return undefined;
   }
 };