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rewriteutil: replace "null changeset" by "the null revision" in error message

Authored by martinvonz.

Description

rewriteutil: replace "null changeset" by "the null revision" in error message

The evolve extension uses "the null revision" and we seem to use that
term much more frequently in core too.

Differential Revision: https://phab.mercurial-scm.org/D10514