[Bug 1614080] [NEW] PATH contains dot when PATH is unset before running bash

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On ubuntu 16.04 (but also 14.04), running bash with PATH unset always
adds '.' to PATH:

philippe at pv-desktop:~$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
philippe at pv-desktop:~$ unset PATH
philippe at pv-desktop:~$ /bin/bash
philippe at pv-desktop:~$ echo $PATH
/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:.

Even when testing in a virtual machine / docker, and erasing
/root/.profile /root/.bashrc /etc/profile /etc/bash.bashrc the problem
still happens.

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
PATH contains dot when PATH is unset before running bash
https://bugs.launchpad.net/bugs/1614080
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