init_notebook_mode() breaks conversion of notebook to slides

[llambourne]

Hi,

If I try and convert a test notebook to slides using
jupyter nbconvert --to slides test.ipynb --post serve

if the notebook contains a call to plotly.init_notebook_mode() then the resulting slides are just a blank page and I get the following javascript error:
TypeError: require is not a function
from where the require function is called at the bottom of the test.slides.html file that nbconvert produces.

the issue seems to be as a result of the javascript:
require=requirejs=define=undefined;
in init_notebook_mode()

[jonmmease]

require=requirejs=define=undefined is no longer performed in init_notebook_mode()