<li id="layer_{{optionInfo.id}}" class="list-group-item">
    <div class="row">
        <div class="col-md-6">
            <span>{{optionInfo.title}}</span>  
        </div>
        <div class="col-md-2">
            <div class="thumbnail-image" ng-show="optionInfo.thumbnail_image">
                <a class="btn btn-default" ng-click="addLayerToDesign(optionInfo)">
                    <img src="{{mediaUrl + optionInfo.thumbnail_image}}" width="100%" />
                </a>
            </div>
        </div>
        <div class="col-md-4">
            <div class="action-btn pull-right">
                <a class="btn btn-xs btn-default expand-layer" ng-click="expandLayer(optionInfo)" ng-show="optionInfo.options">
                    <span class="glyphicon" ng-class="{'glyphicon-plus': expand === true, 'glyphicon-minus': expand === false}" aria-hidden="true"></span>
                </a>
                <a class="btn btn-xs btn-info edit-layer" ng-click="editLayer(optionInfo);">
                    <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                </a>
                <a class="btn btn-xs btn-warning remove-layer" ng-click="removeLayer(optionInfo)">
                    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                </a>
            </div>
        </div>
    </div>
</li>
<li id="layer_{{optionInfo.id}}" class="list-group-item">
    <div class="row">
        <div class="col-md-6">
            <span>{{optionInfo.title}}</span>  
        </div>
        <div class="col-md-2">
            <div class="thumbnail-image" ng-show="optionInfo.thumbnail_image">
                <a class="btn btn-default" ng-click="addLayerToDesign(optionInfo)">
                    <img ng-if="optionInfo.thumbnail_image" src="{{mediaUrl + optionInfo.thumbnail_image}}" width="100%" />
                </a>
            </div>
        </div>
        <div class="col-md-4">
            <div class="action-btn pull-right">
                <a class="btn btn-xs btn-default expand-layer" ng-click="expandLayer(optionInfo)" ng-show="optionInfo.options">
                    <span class="glyphicon" ng-class="{'glyphicon-plus': expand === true, 'glyphicon-minus': expand === false}" aria-hidden="true"></span>
                </a>
                <a class="btn btn-xs btn-info edit-layer" ng-click="editLayer(optionInfo);">
                    <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                </a>
                <a class="btn btn-xs btn-warning remove-layer" ng-click="removeLayer(optionInfo)">
                    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                </a>
            </div>
        </div>
    </div>
</li>
Fix show thumbnail if exists
Fix show thumbnail if exists
