python-smartpm: Don't ignore error if RPM transaction fails without problems

python-smartpm: Don't ignore error if RPM transaction fails without problems

SmartPM could misinterpret RPM transaction error as success,
if ts.run() (RPM Python API) returns an empty problems list.

This could happen for example if the RPM database is partially corrupted
such that the transaction does not have any problems like conflicts or
missing dependencies, but still can't be committed.

The added patch fixes the problem in the upstream sources;
one of the existing patches has to be adjusted to still apply.

Signed-off-by: Daniel Klauer <daniel.klauer@gin.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>