Hide the 'templates' list header if the category is empty

www/drive/file.less

@@ -538,8 +538,10 @@ span {
                 padding: 0 5px;
                 display: table-cell;
             }
+            &:not(.header) {
+                height: @toolbar-line-height;
+                line-height: @toolbar-line-height;
             }
-        li {
             &.header {
                 cursor: default;
                 color: @table-header-fg;

www/drive/main.js

@@ -1650,8 +1650,10 @@ define([
         // and they don't hav a hierarchical structure (folder/subfolders)
         var displayHrefArray = function ($container, rootName, draggable) {
             var unsorted = files[rootName];
+            if (unsorted.length) {
                 var $fileHeader = getFileListHeader(false);
                 $container.append($fileHeader);
+            }
             var keys = unsorted;
             var sortBy = Cryptpad.getLSAttribute(SORT_FILE_BY);
             sortBy = sortBy === "" ? sortBy = 'name' : sortBy;