Issue 2747 - Added empty state for tables in options page

skin/options.css

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 326 matching lines @@
   padding: 14px 0px;
   -webkit-padding-start: 16px;
   -moz-padding-start: 16px;
 }
 
 .table.list li .display
 {
   flex: 1;
 }
 
-.table.list li:nth-child(odd)
+.table.list li:nth-child(odd),
+.table.cols li:nth-child(even),
+.table li.empty-placeholder
 {
   background-color: #F5F5F5;
 }
-
-.table.cols li:nth-child(even)
-{
-  background-color: #F5F5F5;
-}
 
 .table label
 {
   vertical-align: top;
 }
 
 .table.cols span
 {
   display: inline-block;
   width: 30%;
@@ skipping 212 matching lines @@
 {
   width: 100%;
 }
 
 #whitelisting .controls
 {
   -moz-padding-start: 12px;
   -webkit-padding-start: 12px;
 }
 
+#whitelisting .controls.mode-edit > button,
+#whitelisting .controls:not(.mode-edit) > div
+{
+  display: none;
+}
+
 #whitelisting .controls input[type="text"]
 {
   border: 0px;
   border-bottom: 1px solid #A1A1A1;
   -moz-padding-end: 25px;
   -webkit-padding-end: 25px;
   -moz-margin-start: 14px;
   -webkit-margin-start: 14px;
   outline: 0px;
   padding-bottom: 5px;
@@ skipping 501 matching lines @@
 #other-language .button-add::before
 {
   display: none;
 }
 
 #other-language .display
 {
   -webkit-margin-start: 10px;
   -moz-margin-start: 10px;
 }