[Dovecot] piegonhole seg fault with NULL user

[Stephan Bosch]

Eray Aslan wrote:
> dovecot-2.0-piegonhole commit cac6acdc4d0e:
>
> Crash when USER is NULL.  Backtrace is below.  Perhaps, we should check
> for NULL and bail out early?
>
> Eray
>   
Occurs only in the Sieve tools and the testsuite. This should fix it:

http://hg.rename-it.nl/dovecot-2.0-pigeonhole/rev/0592366457df

Regards,

Stephan.