If an extension is not registered, ``bob.io.base.load`` with crash the Python interpreter
The following script will reproduce the issue:
$ touch test.jpg
And then the script that will cause the crash:
import bob.io.base bob.io.base.load('test.jpg')
$ python test.py terminate called after throwing an instance of 'std::runtime_error' what(): unregistered extension: .jpg Aborted (core dumped)
Expected result: Script is interrupted with a Python exception and does not core dump.