[CAUSEWAY-2776] @Parameter(regex=...) does not allow for parameter to also be optional. - ASF JIRA

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In other words, if null is provided then the regex fails. It should just ignore.

This shows up as a problem for the simple case, eg:

`@Parameter(regex=..., optionality=OPTIONAL)`

it also shows up in the case of a chained meta-annotation:

@Parameter(regex=..., optionality=MANDATORY)
public @interface Reference {}

and

@Parameter(optionality=OPTIONAL)
@Reference
public @interface VatCode {}

where we want parameters annotated with `@VatCode` to be optional, overriding the inherited mandatory from `@Reference`.

links to

GitHub Pull Request #650