[Bug] MagmaLoad fails if a cell didn't finish executing

[Akulen]

I got this error while attempting to do a MagmaLoad:

Error detected while processing function Jupyter[8]..remote#define#CommandBootstrap[5]..remote#define#request: line    2:
[Magma] Error while doing Magma IO: Incorrect type for key 'execution_count': expected int, got NoneType

After checking the corresponding json, there was effectively a 'execution_count': null, and I managed to fix the issue by adding manually an unused number. My guess is that this was caused because I did a MagmaSave while a cell hadn't finished running, but I feel like this should not cause an error, and magma should be able to load information about a partially executed cell and display it as such.

[dccsillag]

Yup, good call. Will fix.