fix author in learning object view

app/views/learning_objects/_learning_object_horizontal.erb

@@ -23,7 +23,7 @@
         <h4 class="learning-object-heading"><%= learning_object_title learning_object %></h4>
       <% end %>
 
-      <span class="author-label">Por <%= learning_object.get_metadata_value_of("dc.contributor.author") %></span><br/>
+      <span class="author-label">Por <%= learning_object.author || learning_object.publisher.name %></span><br/>
       <i class="fa fa-eye" data-toggle="tooltip" data-placement="bottom" title="Visualizações"></i><%= learning_object.views.count %>&nbsp;&nbsp;&nbsp;
       <i class="fa fa-thumbs-up" data-toggle="tooltip" data-placement="bottom" title="Curtidas"></i><span data-id="<%= learning_object.id %>" class="votes-count"><%= learning_object.likes.count %></span><br>
 

app/views/learning_objects/_learning_object_vertical.erb

@@ -15,7 +15,7 @@
       <h4 class="media-heading"><%= learning_object_title(learning_object) %></h4>
       <i class="fa fa-eye" data-toggle="tooltip" data-placement="bottom" title="Visualizações"></i><%= learning_object.views.size %>&nbsp;
       <i class="fa fa-thumbs-up" data-toggle="tooltip" data-placement="bottom" title="Curtidas"></i><span data-id="<%= learning_object.id %>" class="votes-count"><%= learning_object.likes.size %></span>&nbsp;
-      <span class="author-label">Por <%= learning_object.get_metadata_value_of("dc.contributor.author") %></span>
+      <span class="author-label">Por <%= learning_object.author || learning_object.publisher.name %></span>
     </div>
   </div>
 </div>