General fixes

+Fixed a bug that permitted to attack occupied oasis (even through the
farmlist) even if the oasis' owner was banned
+Rewritten some code in Units.php, for a better errors handling
+Fixed some errors that could have showed sometimes
+Fixed a bug that didn't permit to send an attack under certain
circumstances
+Villages/oasis with X = 0 or Y = 0 as a coordinates, can now be raided
+You are now be able to send resources with the merchants, at villages
with X = 0 or Y = 0 as a coordinates

Templates/Alliance/Forum/forum_2.tpl

@@ -13,8 +13,7 @@ if($session->access == BANNED){
 $opt = $database->getAlliPermissions($session->uid, $aid);
 $displayarray = $database->getUserArray($session->uid, 1);
 $forumcat = $database->ForumCat(htmlspecialchars($displayarray['alliance']));
-
-$forumcat = array_merge($forumcat, 
+$forumcat = array_merge(!empty($forumcat) ? $forumcat : [], 
 						$session->sharedForums['alliance'],
 						$session->sharedForums['confederation'], 
 						$session->sharedForums['closed']);