Make sure to convert to 'int'.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16887 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ListBox.py

@@ -2154,7 +2154,7 @@ class ListBoxHTMLRenderer(ListBoxRenderer):
     list_lines =self.getParamDict().get('list_lines', None)
     if list_lines is not None:
       # it's possible to override max lines from selection parameters
-      return list_lines 
+      return int(list_lines)
     return self.field.get_value('lines')
 
   getMaxLineNumber = VolatileCachingMethod(getMaxLineNumber)