log-log errorbar plots with errorbars including zero

I regularly make log-log errorbar plots where the errors are larger than
the y values. This means that the error bar goes a finite distance
upwards, but should go infinitely far downwards. In Debian's 0.87.7-0.3
package, just the top portion is drawn, which seems like a reasonable
solution. But in Ubuntu's 0.90.1-2ubuntu1 package, trying to do a
plot like this causes an error. Any ideas?


$ python
Python 2.5.1 (r251:54863, Oct 5 2007, 13:36:32)
[GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

from pylab import *

(<matplotlib.lines.Line2D instance at 0xb5ac024c>, [<matplotlib.lines.Line2D instance at 0xb5ac00cc>, <matplotlib.lines.Line2D instance at 0xb5ac00ec>], [<matplotlib.collections.LineCollection instance at 0xb5abdfac>])


Exception in Tkinter callback
Traceback (most recent call last):
  File "lib-tk/Tkinter.py", line 1406, in __call__
    return self.func(*args)
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py", line 151, in resize
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_tkagg.py", line 154, in draw
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/backend_agg.py", line 392, in draw
  File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line 601, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 1286, in draw
  File "/usr/lib/python2.5/site-packages/matplotlib/collections.py", line 700, in draw
ValueError: Domain error on transOffset->operator in draw_line_collection