Add :include_blank option to Field::Select

[efatsi]

• copy/pasted pretty directly from Field::BelongsTo
• defaults to true similar to BelongsTo configuration

[efatsi]

Had a thought: perhaps a better move would be to set the default to false for the new Fields::Select#include_blank option. That would mean this PR is not a breaking change, and users could opt-in to including a blank option.

Anyone on the maintenance team have an opinion here?

[pablobm]

Thank you for this @efatsi. I agree that we want to avoid unexpected changes of behaviour, and therefore the default should be the same as it is now. Would you be able to make this change?

[efatsi]

Can do!

[efatsi]

@pablobm just pushed an update. Looks like ruby-25 failed on Circle, although the failure seems unrelated to the changes I've made.

[pablobm]

I think I have figured out the issue with CI (see #2023). Let me double-check it works, merge the fix, and I'll merge this.