fix(document-grid): rename lastSuccessful alias

It is conflicting with the documents service.

Author: fkm-adfinis

addon/components/document-grid.hbs

@@ -44,7 +44,7 @@
               </div>
             {{/each}}
           {{else}}
-            {{#each this.documents as |document|}}
+            {{#each this.fetchedDocuments as |document|}}
               {{! This wrapper div is needed for the uk-grid spacing between elements }}
               <div data-test-document-container>
                 <LinkTo

addon/components/document-grid.js

@@ -18,14 +18,14 @@ export default class DocumentGridComponent extends Component {
   get selectedDocument() {
     if (this.args.selectedDocumentId) {
       return (
-        this.documents &&
+        this.fetchedDocuments &&
         this.store.peekRecord("document", this.args.selectedDocumentId)
       );
     }
     return undefined;
   }
 
-  @lastValue("fetchDocuments") documents;
+  @lastValue("fetchDocuments") fetchedDocuments;
   @task
   *fetchDocuments() {
     return yield this.store.query("document", {