Issue #2075475 by sqndr, Oostie, meladawy, temaruk, LewisNyman: Theme with no...

Issue #2075475 by sqndr, Oostie, meladawy, temaruk, LewisNyman: Theme with no screenshot causes CSS height issue.

core/modules/system/css/system.admin.css

@@ -269,9 +269,6 @@ table.system-status-report .status-title {
   height: auto;
   text-align: center;
 }
-.theme-selector .no-screenshot {
-  display: none;
-}
 .theme-default .screenshot {
   border: 1px solid #aaa;
 }
@@ -320,17 +317,6 @@ table.system-status-report .status-title {
   body:not(.toolbar-vertical) .system-themes-list-disabled .theme-info {
     min-height: 170px;
   }
-  body:not(.toolbar-vertical) .no-screenshot {
-    display: block;
-    padding-bottom: 57%;
-    position: relative;
-  }
-  body:not(.toolbar-vertical) .no-screenshot__text {
-    margin-top: -0.76em;
-    position: absolute;
-    top: 50%;
-    width: 100%;
-  }
 }
 
 /**
@@ -366,17 +352,6 @@ table.system-status-report .status-title {
   .toolbar-vertical .system-themes-list-disabled .theme-info {
     min-height: 170px;
   }
-  .toolbar-vertical .no-screenshot {
-    display: block;
-    padding-bottom: 57%;
-    position: relative;
-  }
-  .toolbar-vertical .no-screenshot__text {
-    margin-top: -0.76em;
-    position: absolute;
-    top: 50%;
-    width: 100%;
-  }
 }
 .system-themes-list-enabled .theme-info {
   max-width: 940px;

core/modules/system/system.admin.inc

@@ -452,7 +452,13 @@ function template_preprocess_system_themes_page(&$variables) {
         );
       }
       else {
-        $current_theme['screenshot'] = array();
+        $current_theme['screenshot'] = array(
+          '#theme' => 'image',
+          '#uri' => drupal_get_path('module', 'system') . '/images/no_screenshot.png',
+          '#alt' => t('No screenshot'),
+          '#title' => t('No screenshot'),
+          '#attributes' => new Attribute(array('class' => array('no-screenshot'))),
+        );
       }
 
       // Localize the theme description.

core/modules/system/templates/system-themes-page.html.twig

@@ -34,10 +34,6 @@
         <div{{ theme.attributes }}>
           {% if theme.screenshot %}
             {{ theme.screenshot }}
-          {% else %}
-            <div class="no-screenshot">
-              <div class="no-screenshot__text">{{ "no screenshot"|t }}</div>
-            </div>
           {% endif %}
           <div class="theme-info">
             <h3>