Python bindings and Xapian exceptions

[Sebastian Spaeth]

>   A Xapian exception occurred finding message: The revision being read
>   has been discarded - you should call Xapian::Database::reopen() and
>   retry the operation.
> It makes the Python bindings almost useless to me.

Not sure, if the python bindings should simply drop and reopen a
database connection in that case? But I am not sure if libnotmuch.so
still simply exits on such an error case.

The proper fix, and a reason why I am not immediately hacking around in
the python bindings is that notmuch the library would actually return a
proper error value rather than print to stderr and quit.

Happy to receive suggestions on how to handle this best from the python
side of things.

Sebastian
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