Passing in nested arrays as children silently fails with `component.type` is undefined

[chriddyp]

[rmarren1]

This is caught by plotly/dash#340

[Buuntu]

I am getting a similar error, not sure what the cause is. Was this fixed? All of my pages are displaying this error on the frontend.

[Buuntu]

I am getting weird callback issues (like not being called or not redisplaying the output when updated) and am wondering if this is the cause.

[alexcjohnson]

This should not be an issue any more with the recent dev tools improvements