Fix for java.lang.IllegalStateException: group_no_file must not be null

app/src/main/java/chat/rocket/android/files/ui/FilesFragment.kt

@@ -78,6 +78,7 @@ class FilesFragment : Fragment(), FilesView {
     }
 
     override fun showFiles(dataSet: List<FileUiModel>, total: Long) {
+        ui {
             setupToolbar(total)
             if (adapter.itemCount == 0) {
                 adapter.prependData(dataSet)
@@ -96,7 +97,7 @@ class FilesFragment : Fragment(), FilesView {
                 group_no_file.isVisible = dataSet.isEmpty()
             } else {
                 adapter.appendData(dataSet)
-
+            }
         }
     }