V4.99b: Fix another php warning

Makefile

@@ -2,7 +2,7 @@ BASE=rules_shipping
 BASE_ADV=rules_shipping_advanced
 PLUGINTYPE=vmshipment
 ZIPBASE=opentools_vm2
-VERSION=4.99a
+VERSION=4.99b
 
 PLUGINFILES=$(BASE).php $(BASE)_base.php $(BASE).script.php $(BASE).xml index.html
 PLUGINFILES_ADV=$(BASE_ADV).php $(BASE)_base.php $(BASE_ADV).script.php $(BASE_ADV).xml index.html

rules_shipping.xml

@@ -6,7 +6,7 @@
     <authorUrl>http://www.open-tools.net</authorUrl>
     <copyright>Copyright (C) 2013-2014, Reinhold Kainhofer</copyright>
     <license>GPL v3+</license>
-    <version>4.99a</version>
+    <version>4.99b</version>
     <description>VMSHIPMENT_RULES_DESC</description>
     <files>
         <filename plugin="rules_shipping">rules_shipping.php</filename>

rules_shipping_advanced.xml

@@ -6,7 +6,7 @@
     <authorUrl>http://www.open-tools.net</authorUrl>
     <copyright>Copyright (C) 2013-2014, Reinhold Kainhofer</copyright>
     <license>GPL v3+</license>
-    <version>4.99a</version>
+    <version>4.99b</version>
     <description>VMSHIPMENT_RULES_ADV_DESC</description>
     <files>
         <filename plugin="rules_shipping_advanced">rules_shipping_advanced.php</filename>

rules_shipping_base.php

@@ -465,11 +465,13 @@ class plgVmShipmentRules_Shipping_Base extends vmPSPlugin {
 				}
 			}
 		} else {
-			if(!defined('VM_VERSION') or VM_VERSION < 3){ // VM2:
+			// BEGIN_RK_CHANGES: VM change in VM3!
+			if (is_array($calculator->_cartData)) { // VM2:
 				$taxrules = array_merge($calculator->_cartData['VatTax'],$calculator->_cartData['taxRulesBill']);
 			} else { // VM3:
 				$taxrules = array_merge($cart->cartData['VatTax'],$cart->cartData['taxRulesBill']);
 			}
+			// END_RK_CHANGES
 
 			if(!empty($taxrules) ){
 				$denominator = 0.0;