Rest interface: how to match empty fields

Hi all:

Does anybody have any ideas on how to ask a rest interface if a value
is missing? I am working with multilinks specifically, but empty links
or text fields are also a concern.

Use cases:

   issues that do not have a keyword value set (e.g. no keywords, or null)

   issues that do not have the FirstTimeFailure (item #7) keyword set

This is also kind of an issue in the web interface IIRC. E.G. for
links I can't say must not be item 4, I have to say must be
-1,1,2,3,5,6,7,8,9. This obviously doesn't work for multilinks as I
can have both link3 and link 4.

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				-- rouilj
John Rouillard
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My employers don't acknowledge my existence much less my opinions.