evolve: fix the code flow pattern of solving obswdir par and troubled revs
Now we will go to _handlenotrouble() (which prints messages about
no revs to solve) only when there is no troubled revs and working
dir parent is not obsolete.
This change also saves us from an issue which was about looking into the
revset (smartset contains troubled revs to solve) when a rev from the revset
gets hidden. This happens in the case when our wdir parent is obsolete. After
resolving obswdir parent we were looking into the revset to check if there is
any troubled revs to solve but we should have performed this check before
performing the obswdir resolution.
Changes in test file reflect this fixed behaviour.