config: Add and use unknown cat/subcat defines
...for use in init/unknown/unset/invalid situations.
- Adds the defines.
- Puts them to use.
- Fixes a qt var init issue (non-functional).
(Split out from MR !307)
Edited by Lyndon Brown
...for use in init/unknown/unset/invalid situations.
(Split out from MR !307)
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