Fix same input issue for adding a post

Author: CraigChilds94

anchor/routes/posts.php

@@ -252,7 +252,7 @@
 
 		$input['author'] = $user->id;
 
-		if(is_null($input['comments'])) {
+		if(empty($input['comments'])) {
 			$input['comments'] = 0;
 		}