Better error handling in treemap

Hi,

When given data for treemap is somehow flawed, Plotly terminates with error. I think there needs to be some error handling.

In my case, plotting stops here with Cannot read property 'data' of undefined.

Line 87 in 990a960

var isRoot = helpers.isHierarchyRoot(entry);

This is because calc has failed to build cd.hierarchy, but plotOne expects hierarchy to be there.

Since treemap doesn't have axis, I don't know what a blank treemap plot would look like, but I suppose that's waht we need here.

Could you please share a codepen?

@deecay

Thanks for reporting @deecay !!

The equivalent sunburst trace behaves better: https://codepen.io/etpinard/pen/mddMOZo

... probably due to this block:

Lines 99 to 101 in 6c3646a

    
           if(!entry) { 
        
               return slices.remove(); 
        
           }

that we could copy over to treemap/plot.js.

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