For what it is worth I wasn't able to recreate this using the same
package version and command on quantal.  I wonder if you tried to add
the ppa immediately after creating it in Launchpad and that may have
caused an issue.

Looking at it some more I guess something like this would fix it:

if signing_key_fingerprint is None:
    return False

after the try, except for getting the key fingerprint.

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https://bugs.launchpad.net/bugs/1061101

Title:
  TypeError: object of type 'NoneType' has no len()

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