client-barcode: No longer mention absense of deposit for items how never have deposit

client-barcode/freitagslib/commands.py

@@ -55,7 +55,7 @@ class BuyCommand(object):
 		return self._item.name
 
 	def commodity_label(self):
-		if self._deposit:
+		if self._deposit or self.deposit_value() <= 0:
 			return self._item.name
 		else:
 			return "%s (exkl. Pfand)" % self._item.name