MAGETWO-89187: Column Data Separation

- Resolve merge issue

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/column-group/default/preview.html

@@ -5,7 +5,7 @@
  */
 -->
 
-<div class="pagebuilder-column-group" css="{'resizing': resizing, , 'empty-child': hasEmptyChild}">
+<div class="pagebuilder-column-group" css="{'resizing': resizing, 'empty-child': hasEmptyChild}">
     <div class="resize-grid">
         <div class="grid-line"></div>
         <div class="grid-line"></div>