view docs/figures/hgview-example.png @ 5012:5b5cfb9b0a0b

evolve: remove the unnecessary condition to check empty successors set

I annotated the history of this "newer == [()]" condition and found
that it was added in the initial stages of evolution project (more than
8 years ago) and there is no test where we get [()] as a successor set.

So looks like "if not newer" is enough to check if it is empty.
I also looked into obsutil.successorssets() implementation and
I don't think it would give us [()] in any case.

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