Fix error message when searching for nonexistant supplier in receivings

(#430)

application/controllers/Receivings.php

@@ -30,7 +30,10 @@ class Receivings extends Secure_area
 	function select_supplier()
 	{
 		$supplier_id = $this->input->post('supplier');
-		$this->receiving_lib->set_supplier($supplier_id);
+		if ($this->Supplier->exists($supplier_id))
+		{
+			$this->receiving_lib->set_supplier($supplier_id);
+		}
 		$this->_reload();
 	}
 

application/controllers/Sales.php

@@ -516,7 +516,7 @@ class Sales extends Secure_area
 	{
 		// substitute customer info
 		$customer_id = $this->sale_lib->get_customer();
-		if($customer_id != -1 && $cust_info != '' && $cust_info->last_name != '' && $cust_info->first_name != '')
+		if($customer_id != -1 && $cust_info != '')
 		{
 			$text = str_replace('$CU',$cust_info->first_name . ' ' . $cust_info->last_name,$text);
 			$words = preg_split("/\s+/", trim($cust_info->first_name . ' ' . $cust_info->last_name));