Fixes from #3880 (#3885)

Fixes #3880. Credit to @Teranode & @gergo85.

modules/cms/controllers/index/_content_toolbar.htm

@@ -16,10 +16,12 @@
         data-request-success="$.oc.cmsPage.updateTemplateList('content'); $(this).trigger('close.oc.tab', [{force: true}])"
         data-control="delete-button"></button>
 
+    <?php if (isset($lastModified)): ?>
     <span
         class="btn empty oc-icon-calendar"
         title="<?= e(trans('backend::lang.media.last_modified')) ?>: <?= $lastModified ?>"
         data-toggle="tooltip"
         data-placement="right">
     </span>
-</div>
+    <?php endif; ?>
+</div>

modules/cms/controllers/index/_layout_toolbar.htm

@@ -15,11 +15,13 @@
         data-request-confirm="<?= e(trans('cms::lang.layout.delete_confirm_single')) ?>"
         data-request-success="$.oc.cmsPage.updateTemplateList('layout'); $(this).trigger('close.oc.tab', [{force: true}])"
         data-control="delete-button"></button>
-  
+
+    <?php if (isset($lastModified)): ?>
     <span
         class="btn empty oc-icon-calendar"
         title="<?= e(trans('backend::lang.media.last_modified')) ?>: <?= $lastModified ?>"
         data-toggle="tooltip"
         data-placement="right">
     </span>
-</div>
+    <?php endif; ?>
+</div>

modules/cms/controllers/index/_page_toolbar.htm

@@ -27,10 +27,12 @@
         data-request-success="$.oc.cmsPage.updateTemplateList('page'); $(this).trigger('close.oc.tab', [{force: true}])"
         data-control="delete-button"></button>
 
+    <?php if (isset($lastModified)): ?>
     <span
         class="btn empty oc-icon-calendar"
         title="<?= e(trans('backend::lang.media.last_modified')) ?>: <?= $lastModified ?>"
         data-toggle="tooltip"
         data-placement="right">
     </span>
-</div>
+    <?php endif; ?>
+</div>

modules/cms/controllers/index/_partial_toolbar.htm

@@ -16,10 +16,12 @@
         data-request-success="$.oc.cmsPage.updateTemplateList('partial'); $(this).trigger('close.oc.tab', [{force: true}])"
         data-control="delete-button"></button>
 
+    <?php if (isset($lastModified)): ?>
     <span
         class="btn empty oc-icon-calendar"
         title="<?= e(trans('backend::lang.media.last_modified')) ?>: <?= $lastModified ?>"
         data-toggle="tooltip"
         data-placement="right">
     </span>
-</div>
+    <?php endif; ?>
+</div>