form.py requires tuple

[Aaron Swartz]

This form renders incorrectly

import web, simplejson
config = web.storage(simplejson.load(file('config.json', 'r')))
post_form = form.Form(
   form.Textbox("subject", description="Title:"),
   form.Dropdown("category", config.categories,
description="Category:"),
   form.Textarea("entry", rows="20", cols="75" , description="Text:")
)

because form.Dropdown needs each argument to be the 'tuple' type:

   if type(arg) == tuple:

Perhaps it should use web.iters instead?

[Anand Chitipothu (anandology)]

fixed.