Fix tab expansion in inter-patchset diff
Fix tab expansion in inter-patchset diff

There are some lines which were being read as byte arrays and
were not decoded into strings which was causing them to bypass
tab expansion (because they caused an exception which was caught
and the un-expanded text was used instead).  Correct those cases
and disable the exception handler so that we can identify any
other cases by triggering a crash.

Change-Id: I4b34132290fc8611cc770d572068197b33c0789c

openstack/gertty,stackforge/gertty