A way to prevent createOption to add a new option.

[LukasOchmann]

The options passed to v-select are a suggested list of User which can be added to an Organization. If none of the suggestions match the searched user. It is possible to type in an e-mail which then is added. While that creates a new option, i want to check if the E-Mail is already in the added or suggested Members.

Describe the solution you'd like
If either the createOption throws or returns null/undefined adding an option should be omitted.

Additional context
I would prefer the throwing variant, because it is maybe important for someone that adding undefined/null works.