"apt-listbugs list postix" doesn't tell error ...

[Gerard Robin <g.robin3@free.fr>]

Hello,
A small comment about the command "apt-listbugs list".
By mistake I wrote "apt-listbugs list postix" instead "apt-listbugs list postfix"
and I got:

Reading package fields... Done
Reading package status... Done
Retrieving bug reports... Done
Parsing Found/Fixed information... Done

So I did "apt-get install postfix" 
---------------8<-------------------
Reading package fields... Done
Reading package status... Done
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
grave bugs of postfix (2.4.6-5 -> 2.5.1~rc1-1) <pending>
 #311812 - postfix: syslog reconnection
Summary:
 postfix(1 bug)
Are you sure you want to install/upgrade the above packages? [Y/n/?/...]

I was surprised ...

Why "apt-listbugs list postix" doesn't notify like "apt-get install postix":

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Couldn't find package postix

?

--
Gérard