Partial fix for "null" `HGChangeset` "null" changeset is currently kept as a singleton instance, i.e., `HGChangeset null` always return the same object. However, some queries (such as `#isObsolete` or `#successors`) require repository to be set - obviously, for "null" changeset there's no repository. Therefore these queries resulted into DNU. To paetially fix this, short-circuit these query methods to answer trasonable values for "null" changeset. Better solution would be to make "null" changeset a normal changeset within a repository.

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pushd common

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call mingwmake.bat %1 %2 %3 %4 %5 %6 %7 %8 %9

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popd 

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pushd mercurial

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call mingwmake.bat %1 %2 %3 %4 %5 %6 %7 %8 %9

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popd