Move empty file message to diff_content component

app/assets/javascripts/diffs/components/diff_content.vue

@@ -69,7 +69,8 @@ export default {
 <template>
   <div class="diff-content">
     <div class="diff-viewer">
-      <template v-if="isTextFile">
+      <div v-if="diffFile.empty" class="nothing-here-block">{{ __('Empty file') }}</div>
+      <template v-else-if="isTextFile">
         <inline-diff-view
           v-if="isInlineView"
           :diff-file="diffFile"

app/assets/javascripts/diffs/components/diff_file.vue

@@ -176,7 +176,6 @@ export default {
       {{ __('This source diff could not be displayed because it is too large.') }}
       <span v-html="viewBlobLink"></span>
     </div>
-    <div v-if="file.empty" class="nothing-here-block">{{ __('Empty file') }}</div>
   </div>
 </template>