[petsc-dev] DMGetOutputDM hangs on multiple procs

[Sander Arens]

I noticed that DMGetOutputDM hangs when using multiple procs. The culprit
is
https://bitbucket.org/petsc/petsc/commits/c26acbdef0eedda92db6423afb8b38a1502ca0c8.

This doesn't work when one or more procs don't have any constraints while
others have, because the ones with constraints call DMClone (collective)
while the other procs don't.

Thanks,
Sander
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