Christoph Reiter e13c646465 gcancellable: add back lost NULL check in g_cancellable_cancel()
Commit f975858e86 removed the NULL check in g_cancellable_cancel() by
accident which makes it crash when called with NULL.

Add the check back and add a test so this doesn't happen again.

Fixes #1710
2019-03-05 16:44:16 +01:00
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