[backport foxy] Check waitable for nullptr during constructor (#1315)#1379
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[backport foxy] Check waitable for nullptr during constructor (#1315)#1379
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Signed-off-by: Stephen Brawner <brawner@gmail.com>
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jacobperron
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Oct 5, 2020
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Backports #1315 for rclcpp
Signed-off-by: Stephen Brawner brawner@gmail.com