Fix issues with VM3 (errors are removed)

buyer_assign_group.php

@@ -164,11 +164,15 @@ class plgVmCustomBuyer_Assign_Group extends vmCustomPlugin {
 			'virtuemart_shoppergroup_id'=>$groups);
 		$user_shoppergroups_table = $userModel->getTable('vmuser_shoppergroups');
 		$shoppergroupData = $user_shoppergroups_table -> bindChecknStore($shoppergroupData);
-		$errors = $user_shoppergroups_table->getErrors();
-		foreach($errors as $error){
-			$this->setError($error);
-			vmError('Set shoppergroup '.$error);
-			$noError = false;
+		
+		if(!defined('VM_VERSION') or VM_VERSION < 3){
+			// getErrors was removed in VM3!
+			$errors = $user_shoppergroups_table->getErrors();
+			foreach($errors as $error){
+				$this->setError($error);
+				vmError('Set shoppergroup '.$error);
+				$noError = false;
+			}
 		}
 		$user_shoppergroups_table->emptyCache();
 		return $noError;