Update fieldVueMultiSelect.vue. Add noOptions

[jandro5]

https://vue-multiselect.js.org/

noOptions: Shows when no elements in options empty. Defaults to string: Default: List is empty.

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[coveralls]

Coverage remained the same at 89.979% when pulling 9a11717 on jandro5:patch-1 into 721a4ee on vue-generators:master.

[coveralls]

Coverage remained the same at 89.979% when pulling 9a11717 on jandro5:patch-1 into 721a4ee on vue-generators:master.