Upgrading nbformat, as nbformat==5.1.2 and 5.1.3 causes "AttributeError: 'NoneType' object has no attribute 'cells'" due to upgrading nbformat to v4 nb = nbformat.v4.upgrade(nb)
What does this PR do?
Sets nbformat to a minimum version of 5.2.0 to avoid no attribute 'cells'"
Upgrading nbformat, as nbformat==5.1.2 and 5.1.3 causes "AttributeError: 'NoneType' object has no attribute 'cells'" due to upgrading nbformat to v4
nb = nbformat.v4.upgrade(nb)
What does this PR do?
Sets nbformat to a minimum version of 5.2.0 to avoid
no attribute 'cells'"
Fixes #769