bug in dovecot-sieve-1.1.5 & solution

[Dimitar Terziev]

Hello.
I have FreeBSD 7.1 Installed for my mail server.
Today i have installed dovecot-sieve to allow my users make server-side filters.
During the tests, i see error message in my logs:
dovecot sieve sends vacation messages with "null" envelope sender.

[cut]
@40000000496905ea2bbdaf6c info msg 394: bytes 641 from
<<>@mail.w-co-bg.com> qp 36208 uid 1010
@40000000496905ea2bf3fdc4 starting delivery 265: msg 394 to remote
dimitar.terziev at gmail.com
@40000000496905ea2bf5a3a4 status: local 1/10 remote 1/120
@40000000496905ea2c65a384 delivery 264: success: did_0+0+1/
@40000000496905ea2c6d4c74 status: local 0/10 remote 1/120
@40000000496905ea2c7318d4 end msg 343
@40000000496905ec18f5752c delivery 265: failure:
Connected_to_209.85.129.27_but_sender_was_rejected./Remote_host_said:_555_5.5.2_Syntax_error._h2si47944888fkh.29/
[/cut]

The patch is in the file attached.
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