Prevent accidental 'Allow All' (SP) scenario for IdP that moves into production

[mrvanes]

Recently a test IdP that had 'Allow All' set on SP tab was moved into production, causing some grief for single SP-IdP clients that were suddenly confronted with the WAYF.

A possible solution to prevent this shoot-in-the-foot scenario would be to check 'Allow None' and uncheck 'Allow All' on State dropdown "onChange" (to production) event, possibly accompanied by an alert, telling the user that 'Allow None' was checked.