Fix recursion error on malformed use tags #239
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<use>tags with an href attribute that isn't in the right namespace (xlink), trigger an infinite recursion error.This PR introduce a ValueError for malfformed use tags, and lookup href attrs more leniently to support svg generated by some tools (chrome also support those mis-namespaced attributes, and the "lottie-web" framework generate svg files like this)
this fixes #187