abrt version: 1.1.17
architecture: x86_64
cmdline: /usr/bin/python /usr/bin/gourmet
component: gourmet
executable: /usr/bin/gourmet
kernel: 2.6.35.12-88.fc14.x86_64
package: gourmet-0.15.6-4.fc14
reason: convert.py:891:float_to_metric:TypeError: int() argument must be a string or a number, not 'NoneType'
release: Fedora release 14 (Laughlin)
time: 1303504676
uid: 500

backtrace
-----
convert.py:891:float_to_metric:TypeError: int() argument must be a string or a number, not 'NoneType'

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/gourmet/reccard.py", line 422, in shop_for_recipe_cb
    self.rg.sl.addRec(self.current_rec,self.mult,d)
  File "/usr/lib/python2.7/site-packages/gourmet/shopgui.py", line 898, in addRec
    self.reset()
  File "/usr/lib/python2.7/site-packages/gourmet/shopgui.py", line 901, in reset
    self.grabIngsFromRecs(self.recs.values(),self.extras)
  File "/usr/lib/python2.7/site-packages/gourmet/shopgui.py", line 542, in grabIngsFromRecs
    return self.organize_list(self.lst)
  File "/usr/lib/python2.7/site-packages/gourmet/shopgui.py", line 548, in organize_list
    data = self.sh.organize(self.sh.dic)
  File "/usr/lib/python2.7/site-packages/gourmet/shopping.py", line 169, in organize
    itms.append([i,self.amt_to_string(amts)])
  File "/usr/lib/python2.7/site-packages/gourmet/shopping.py", line 122, in amt_to_string
    retstr = self.cnv.amt_string(amts[0])
  File "/usr/lib/python2.7/site-packages/gourmet/convert.py", line 488, in amt_string
    nstring = float_to_frac(num,approx=approx)
  File "/usr/lib/python2.7/site-packages/gourmet/convert.py", line 860, in float_to_frac
    return float_to_metric(n,approx)
  File "/usr/lib/python2.7/site-packages/gourmet/convert.py", line 891, in float_to_metric
    if int(n) != n:
TypeError: int() argument must be a string or a number, not 'NoneType'

Local variables in innermost frame:
format_string: '%.2f'
n: None
approx: 0.01
decimals_to_preserve: 2

How to reproduce
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1. ?
2.
3.