Fixed Community Issue - Error when Zero CIM profiles

Issue: #45

Reproduced the issue by creating a sandbox account with zero customer profiles.
Error for getCustomerProfileIds() :
Notice: Undefined index: numericString in C:\..local_path...\authorizenet\authorizenet\lib\AuthorizeNetCIM.php on line 491

Fixed the issue by adding a check for empty array.

Author: namanbansal

lib/AuthorizeNetCIM.php

@@ -488,7 +488,10 @@ public function getValidationResponse()
     public function getCustomerProfileIds()
     {
         $ids = (array)$this->xml->ids;
-        return $ids["numericString"];
+        if(!empty($ids))
+            return $ids["numericString"];
+        else
+            return $ids;
     }
 
     /**
@@ -497,7 +500,10 @@ public function getCustomerProfileIds()
     public function getCustomerPaymentProfileIds()
     {
         $ids = (array)$this->xml->customerPaymentProfileIdList;
-        return $ids["numericString"];
+        if(!empty($ids))
+            return $ids["numericString"];
+        else
+            return $ids;
     }
 
     /**
@@ -506,7 +512,10 @@ public function getCustomerPaymentProfileIds()
     public function getCustomerShippingAddressIds()
     {
         $ids = (array)$this->xml->customerShippingAddressIdList;
-        return $ids["numericString"];
+        if(!empty($ids))
+            return $ids["numericString"];
+        else
+            return $ids;
     }
 
     /**