Add no files found if no files returned in old-file-browser component.
Add no files found if no files returned in old-file-browser component.

CenterForOpenScience/ember-osf,jamescdavis/ember-osf,baylee-d/ember-osf,CenterForOpenScience/ember-osf,baylee-d/ember-osf,jamescdavis/ember-osf