Nyall Dawson 77941442c7 When a remote SVG is requested but fails, use the missing SVG icon
as an indicator for users that something went wrong

This was previously only used for replies with incorrect mime
types or authentication errors, but it meant that an incorrect
SVG url would silently result in no symbols rendered.

Also add unit tests for fetching remote svg images
2018-03-29 19:50:44 +11:00

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