Bug#848403: diffoscope: FTBFS randomly (Fatal Python error: deallocating None)

[Santiago Vila]

Hi.

I have built version 66 one hundred times in unstable.
The builds were made on 19 different autobuilders.
The number of failed builds has been zero.
(Previously it failed 10% of the time).

If you do not remember what kind of change may have fixed this,
then there must be some broken build-depends in testing which
is fixed in unstable.

I guess the right thing to do would be to find which one, reassign
this bug, and then close it, but we should ensure that the
fixed build-dependency propagates to testing.

Thanks.