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i#2114 signal locks: verify app_sigaction is non-NULL in USE_APP_STACK.

Merged Administrator requested to merge i2214-check-null-sigaction into master

Created by: Carrotman42

As noted in the added code comment, there are points in time where it's possible that the app_sigaction is NULL for a signal. This PR makes us more defensive to avoid a crash on an internal unit test.

Issue #2214