"Internal Error" for bad package suggests an error in USC itself

[Matthew Paul Thomas]

Ubuntu Software Center 5.2.4, Ubuntu 12.04

1. touch ./test.deb
2. xdg-open ./test.deb

What happens: USC displays an "Internal Error", "The file “/home/mpt/test.deb” could not be opened."

What should happen: The error message should not suggest that it is an "Internal Error" to USC.

Maybe no heading, just primary and secondary text like a normal error alert. Something like:
------------
The package “test.deb” can’t be opened because it is damaged or incomplete.

Try downloading the package again, or contact the publisher for an updated version.

(Technical info: Missing package name)
------------

Fixing this would alter the symptoms of bug 868188, bug 989398, and bug 909885.

[Kiwinote (kiwinote)]

fwiw the traceback that causes the 'internal error' message is this (which is called in debfile.py in python-apt):
>>> import apt_inst
>>> apt_inst.DebFile('meh.deb')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
SystemError: E:read, still have 8 to read but none left
>>>