Make 'sponsor' field optional
Recently someone changed trac bugs to have a new 'Sponsor' field. This is fine, but the default is 'None' rather than blank causing all ticket updates to have 'Sponsor set to None'. For those of us not dealing with sponsors this is mildly annoying.
On a side note it would be nice if the 'Severity' defaulted to blank too. I understand folks with the Tor component wanted to add this field but making it default to 'Normal' made it mandatory for everyone. Defaulting it to blank would cause it to not be forced upon the rest of us. ;)
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