[SM-PLUGINS] minor bug report - quota_usage plugin modification to prevent divide by zero error

[Ken A <ka...@pa...>]

Using dovecot, with dovecot using it's quota reporting plugin, accounts 
with no quota set report $total as '0' which causes a divide by zero 
error in the quota_usage plugin.

All I did was add the && $total !== '0'

       # this change made on line 70 & 320
       if ($taken !== '' && $total !== '' && $total !== '0')
          $percent = number_format(($taken / $total) * 100, 1); 

       else
          $percent = '';

Thanks,
Ken

-- 
Ken Anderson
Pacific.Net