dashboard: enhance store upload

circle/dashboard/templates/dashboard/store/_list-box.html

 {% load i18n %}
 
-
 <div class="list-group">
   <div class="list-group-item">
     <div class="row">
       <div class="col-sm-6">
         <a href="{% url "dashboard.views.store-upload"%}?directory={{ current }}"
-          class="btn btn-info btn-xs pull-right js-hidden">
+          class="btn btn-info btn-xs js-hidden">
           {% trans "Upload" %}
         </a>
         <form action="" data-action="{% url "dashboard.views.store-upload-url" %}" 

circle/dashboard/templates/dashboard/store/upload.html

@@ -25,8 +25,9 @@
         <form method="POST" action="{{ action }}" enctype="multipart/form-data">
           <input type="hidden" name="next" value="{{ next_url }}"/>
           <div>
-            <input class="btn btn-default btn-sm pull-right" type="submit" value="{% trans "Upload" %}"/>
-            <input type="file" name="data" style="padding-top: 5px;"/>
+            <input class="btn btn-default btn-sm pull-right" 
+            type="submit" value="{% trans "Upload" %}"/>
+            <input type="file" name="data" style="padding-top: 5px;" required/>
           </div>
         </form>
       </div>