v8: 7647 Can't save content after clearing property with validation error #7662
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Prerequisites
If there's an existing issue for this PR then this fixes #7647
Description
This was due to validation not checking for an empty value, which is a valid state for non-mandatory fields.
Changes here ensure that when we set the validation state on a property form, we check that the property is not mandatory and has no value - if both those flags are true, existing errors are cleared and form controls all reset.
I'm not really across the intricacies of the client-side validation, but from what I can see, the changes fix the problem, and don't impact on existing validation logic. Needs a good sanity check though from someone saner than I.
I've tested by reproducing the scenario from the original bug report. All works as expected - saving with an invalid value displays the validation messages, clearing the value clears the validation.