Unit tests for 22429 and apply same treatment to other money format functions

[demeritcowboy]

Overview

Unit tests for #22429

This will fail at the moment since the fix isn't upmerged to master yet, but that's good since it shows the issue.

[civibot]

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[seamuslee001]

ok forward port has now been done, so confirmed it failed before forward port and now re-running

[seamuslee001]

Jenkins re test this please

[colemanw]

retest this please

[demeritcowboy]

This test passes locally. Will try just rebasing.

[demeritcowboy]

Oh it's the moneyNumber() function that's failing. That function doesn't seem to be used anywhere but maybe needs the same treatment as money().

[demeritcowboy]

Have updated and applied the same empty-ish checks to the other functions that the test exposed.

[seamuslee001]

Looks good to me IMO