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bzrlib/revision.py
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def ensure_null(revision_id):
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    """Ensure only NULL_REVISION is used to represent the null revisionn"""
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    if revision_id is None:
 
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        symbol_versioning.warn('NULL_REVISION should be used for the null'
 
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            ' revision instead of None, as of bzr 0.91.',
 
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            DeprecationWarning, stacklevel=2)
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        return NULL_REVISION
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    else:
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        return revision_id