Problem with errorbar in log scale

When using log scale, if the error is larger than flux, the error bar does not plot at all:

import matplotlib as mpl
mpl.use('Agg')
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
ax.errorbar([1.],[1.],yerr=[2.])
ax.set_yscale('log')
fig.savefig('test.png')

However, I think it would make more correct to plot the line for the errorbar, and to make it go down to -infinity.

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