tell user that we can't reach wallhaven.cc

scrapers/wallhaven.php

@@ -19,6 +19,8 @@
     curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 
     $result = curl_exec($curl);
+    if ($result == null)
+      printf("<p id='error'>Request to wallhaven.cc denied :(</p>\n");
 
     curl_close($curl);