erp5_dms: Fixup PDF_getThumbnailList so that it works also with ERP5JS

Also, remove trailing whitespace

bt5/erp5_dms/SkinTemplateItem/portal_skins/erp5_dms/PDF_getThumbnailList.py

@@ -10,14 +10,14 @@ page_number = int(content_information.get('Pages', 0))
 limit = kw.get('limit', (0, 0))
 list_start = int(kw.get('list_start', 0))
 list_lines = int(kw.get('list_lines', 0))
-size = list_lines or limit[1]
+size = list_lines or int(limit[1])
 
 list_end = list_start + size
 page_list = range(page_number)
 
 result = []
 for i in page_list[list_start:list_end]:
-  x = {'title': '%s' %i, 
+  x = {'title': '%s' %i,
        'frame':'%s' %i} # frame is used by listbox render field
   temp_object = newTempBase(context, x['title'], **x)
   result.append(temp_object)