Misc/Fixup

* test arrays first before use, not the other way round
 * do not try to init local arena team entries if there are no entries in list.
 * fix equally distributing chars/guilds/arenateams across realms for unlimited (0) lists
 * fix double declaration of realms in ArenateamList

includes/utilities.php

@@ -829,14 +829,14 @@ abstract class Util
 
     public static function createSqlBatchInsert(array $data) : array
     {
+        if (!count($data) || !is_array(reset($data)))
+            return [];
+
         $nRows  = 100;
         $nItems = count(reset($data));
         $result = [];
         $buff   = [];
 
-        if (!count($data))
-            return [];
-
         foreach ($data as $d)
         {
             if (count($d) != $nItems)