[Bug 80307] Please adjust "failed to load external entity" error message

[Luca Falavigna]

Public bug reported:

When searching for bugs in source packages which ships multiple tasks, bughelper fails with "failed to load external entity" error messages.
It is not very clear and should be changed to something more intuitive.

** Affects: bughelper (upstream)
     Importance: Undecided
         Status: Unconfirmed

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Please adjust "failed to load external entity" error message
https://launchpad.net/bugs/80307