Do not crash when the GLFW returns a null pointer to an array. #596
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Many functions in GLFW return NULL when no data is available. Using `slice::from_raw_parts()` in a null pointer is not correct, return an empty `Vec` instead.
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Many functions in GLFW return NULL when no data is available. Using
slice::from_raw_parts()in a null pointer is not correct, return an emptyVecinstead.For example, calling
Joystick::get_buttons()in a non-connected joystick would crash the program. I added a few more checks, just in case.