Check for null GH canvas#3
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andrewheumann
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Reviewed 1 of 1 files at r1.
Reviewable status:complete! all files reviewed, all discussions resolved (waiting on @sbaer)
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Add null checks for the GH Canvas. When run from the grasshopper player (and grasshopper has never been run), the window can throw an unhandled exception that can take Rhino completely down. Adding the null checks makes this exception go away.
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