[C++-sig] [patch] Boost.Python STL input iterator does not propagate exceptions

[Andreas Klöckner]

Hi Eric,

The attached patch fixes an exception propagation issue in the STL input 
iterator in Boost.Python. The problem is as follows: PyIter_Next may return 0 
for two reasons: 

- No more iterants left.
- An exception was caught.

The current implementation interprets the latter as the former. A simple fix 
(throw error_already_set if appropriate) is attached.

I'd appreciate it if you could commit this. If there are any issues, please 
let me know and I'll do my best to fix them.

Thanks,
Andreas
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