Sidehistorik
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In short, this is regarding customefields (etc) that can be empty (as having a null value in the database) - typically represented as "none" is a select filedfield or blank in a string.
To sum up, if You are searching a project and You JQL has some "not in" or "!=" operation, be sure to add a phrase for EMPTY:
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needs to be written as
| Kodeblok |
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PROJECT = CUSTOMER1 AND (Classification not in ("Patch Management") OR classification is empty) |
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So It seems for every negation on fields and labels etc in Your JQL, EMPTY need to be taken in account also.