HUE-8155 [metastore] Style the description column placeholder

apps/metastore/src/metastore/static/metastore/less/metastore.less

@@ -285,6 +285,13 @@
 
   .metastore-description-col {
     position: relative;
+
+    .editable-inline-empty {
+      font-style: italic;
+      display: inline-block;
+      color: @cui-gray-700;
+      margin-right: 4px;
+    }
   }
 
   .metastore-property:first-child {