Conflict with BlackMagicTicketTweaksPlugin

[Todd Radel]

If you use the BlackMagicTicketTweaksPlugin to hide a date field, you will not be able to save any ticket, even if date_empty = true. The DateFieldPlugin will throw a validation warning every time.

To reproduce, add the following to trac.ini:

[ticket-custom]
testdate = text
testdate.date = true
testdate.date_empty = true

[blackmagic]
tweaks = testdate
testdate.ondenial = hide
testdate.permission = TICKET_MODIFY

The blackmagic plugin removes the field completely, so the validate_ticket function in filter.py sees the value as NoneType, and cannot call strip(). I replaced line 69 of filter.py with the following:

                val = ticket[field]
                if val:
                    val = val.strip()

[Robert Corsaro]

r6199