Merge pull request #243 from ijlee2/il-10312019

Add presentation role to image in es-card if its alternate text is empty string

Author: MelSumner

addon/templates/components/es-card.hbs

@@ -1,6 +1,6 @@
 <li class="card" ...attributes>
   {{#if @image}}
-    <img class="card__image" src={{@image}} alt={{if @alt @alt ""}}>
+    <img class="card__image" src={{@image}} alt={{if @alt @alt ""}} role={{unless @alt "presentation"}}>
   {{/if}}
   <div class="card-content">
     {{yield}}