Neil Fraser 7bb89f53a5 Don’t throw error for unlinked nodes in Chrome ...

evt.target in Chrome is the abandoned shape, not connected to the DOM.  evt.target in Firefox is the svgroot.

Add checks to ensure that no matter what node is presented by the event, there are no property calls to null or undefined.

Fixes issue #232.

2018-05-17 12:04:58 -07:00

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