Bug 1814872 - Fix degenerate radial gradient handling r=emilio
This is a change from SVG 1.1 where we only had to check for r=0 because fr did not exist.
The SVG 2 behaviour was clarified in https://github.com/w3c/svgwg/issues/648
Differential Revision:
https://phabricator.services.mozilla.com/D168783
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