Issue #439: Add dataUrl error handling callback function #440
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Anemy
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Issue: #439
This PR adds a callback function to the Datamaps constructor which is called when the
dataUrlsupplied with thegeographyConfigfails to load.This addition should allow for more explicit error handling, the current functionality throws an error asynchronously which cannot be caught easily.
Note: Another way we could go about this is to mutate the
donecallback to allow for error passing. However I'm thinking that could break a few peoples assumptions of that function.