apt-add-repository --remove acts if it adds a repository even though it doesn't

[frogsoncrazid]

When I run "apt-add-repository --remove" it prompts, that it's adding given repository - which is obviously not the expected behaviour - after the process has ended, the repository is gone - as expected.

===Here is the command lin in su===

KOXI07-MINT fk # apt-add-repository ppa:nemequ/sqlheavy --remove
You are about to add the following PPA to your system:
 SQLHeavy
 Official PPA for SQLHeavy.
 More info: https://launchpad.net/~nemequ/+archive/sqlheavy
Press [ENTER] to continue or ctrl-c to cancel adding it

KOXI07-MINT fk # apt-add-repository --remove ppa:nemequ/sqlheavy
You are about to add the following PPA to your system:
 SQLHeavy
 Official PPA for SQLHeavy.
 More info: https://launchpad.net/~nemequ/+archive/sqlheavy
Press [ENTER] to continue or ctrl-c to cancel adding it

Error: 'deb http://ppa.launchpad.net/nemequ/sqlheavy/ubuntu lisa main' doesn't exist in a sourcelist file

===Extra data, asked for===
KOXI07-MINT fk # lsb_release -rd
Description: Linux Mint 12 Lisa
Release: 12

KOXI07-MINT fk # apt-cache policy software-properties-common
software-properties-common:
  Installed: 0.81.13.4
  Candidate: 0.81.13.4
  Version table:
 *** 0.81.13.4 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric-updates/main i386 Packages
        100 /var/lib/dpkg/status
     0.81.13.3 0
        500 http://security.ubuntu.com/ubuntu/ oneiric-security/main i386 Packages
     0.81.10 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages

[Matt Fischer (mfisch)]

I was unable to confirm that in my version:

ii python-software-properties 0.82.7.1 manage the repositories that you install software from
ii software-properties-common 0.82.7.1 manage the repositories that you install software from (common)

mfisch@caprica:~$ sudo apt-add-repository ppa:foo/ppa --remove
You are about to remove the following PPA from your system:

 More info: https://launchpad.net/~foo/+archive/ppa
Press [ENTER] to continue or ctrl-c to cancel removing it

mfisch@caprica:~$

[Matt Fischer (mfisch)]

Judging from the bzr changelogs, this was fixed in commit 84, which corresponds to version software-properties (0.82). Please upgrade and try the newer version.