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

[Aaron Bentley]

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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
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