[Bf-committers] small fix for import_3ds.py

[Ed Halley]

I think this one's for Campbell Barton, but in case anyone else wants to 
get it...

On line 289 on my version of import_3ds.py script, it is catching 
AttributeError exceptions.  It should instead (or in addition) catch 
ValueError exceptions at that point, and handle it similarly.  I added 
that as an additional clause in my scratch copy and it let me proceed to 
load a test .3ds I needed.  In case it's important, it was conflicting 
on a camera name, not a mesh object name.

There's another object-naming bug which I've not fully tracked down, but 
is not too critical, but may be related.  It appears off by a name, so 
that imported components get names that are meant for other components 
from the same .3ds file.  An airplane may get two wings and a fuselage, 
but their names seem to be assigned off.

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[ e d @ h a l l e y . c c ]