if dbinit.py contains errors (which is quite possible
as that file is supposed to be edited by the tracker
admin),
'roundup-admin initialise' will generate a bogus error
saying 
 " 'module' object has no attribute 'init' "

It would be far more useful to catch load errors and report
correctly what went wrong, instead of initializing the
'module' with a dummy placeholder object.

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Yeah, the try/except in the instance __init__ has always been evil. I 
guess it's time to actually try to come up with a better solution. 

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what errors can occure here ? Why are you catching exceptions
in the first place, instead of just letting the caller deal
with them ?

If you want the convenience of a clear error message (and no
backtrace), you should probably wrap the imp.load_package()
in a try block, and then issue a sensible error message and
abort...

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I'm going to move this discussion to the mailing list where it's easier.