Fix check for None input.
Fix check for None input.

Passing numpy array between CodeRunner modules made this one manifest.
Casting non-empty numpy array to boolean is ambiguous. Have now
changed to "od is not None" which is less concise but more to the
point.

fvpolpeta/devide,chrisidefix/devide,zhangfangyan/devide,zhangfangyan/devide,ivoflipse/devide,chrisidefix/devide,ivoflipse/devide,nagyistoce/devide,nagyistoce/devide,fvpolpeta/devide