noSelection attribute gets overridden when the field is not required

When we configure the noSelection parameter, it gets ignored by the tag when setting required to false. It's basically this line of code (that's everywhere in the FormFieldsTagLib.groovy):

`if (!model.required) attrs.noSelection = ["": ""]`

I, for one, see no functional connection between a value not being required, and the "noSelection" being ignored. The use case where you want to provide a "noSelection" param, in a non-required field, seems quite logical to me.

On the other hand, if the field is required, then this makes sense to override this to null. The `["": ""]` value actually ends up showing a blank option in select box, which again is something not so desirable. I'd request this overriding be removed entirely & let users have the control what they want to show there.

Start in FormFieldsTagLib.groovy and inspect the repeated assignments that replace attrs.noSelection based on model.required. Confirm the intended behavior for required and non-required fields from the issue, then verify that configured noSelection values are preserved and unwanted blank options are not introduced.

Written by the indexing model from the issue text.