[pymvpa] minor bug ?

[brice rebsamen]

from the latest GIT code,
when importing mvpa.suite
I get the following warning messages:

Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: divide by zero encountered in power
Warning: invalid value encountered in _cdf_single_call (vectorized)

I traced that it occurs in mvpa.support.stats.py when testing if
externals.exists('good scipy.stats.rdist')

Regards
Brice