TypeError if narration index is absent

[csku]

Currently, a narration index is basically mandatory. Line 203 in bb_import.py causes a TypeError to be thrown because that index is NoneType. Can be fixed by checking for the existence of args.indexes.narration. I will create a pull request.

[luciano-fiandesio]

I'm unable to reproduce this issue, the import should not fail if narration is not present

[ihinsdale]

I also encountered this.

@luciano-fiandesio Thanks for this library!

[luciano-fiandesio]

hi @ihinsdale would you be able to send a obfuscated test CSV file, I'm not sure how to reproduce it.