[bug 93853][merge] Better message about inability to place tags in empty branch

[John Arbash Meinel]

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Aaron Bentley wrote:
> James Westby wrote:
>> On (30/07/07 15:59), John Arbash Meinel wrote:
>>> I think we would want to do:
>>>
>>> revision_id = ensure_null(revision_id)
>>> if revision_id != _mod_revision.NULL_REVISION:
>>>     raise errors.***
>> Should that be an equality test?
> 
> It should be an equality test, rather than an identity test (because the
> string 'null:' can come from many sources), but it looks like the sense
> is inverted.  Should probably be "if revision_id ==
> _mod_revision.NULL_REVISION".
> 
> Aaron

yeah, I'm sure actually testing it would have caught that problem.

John
=:->
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