FIRST-Tech-Challenge / FIRST-Tech-Challenge/FtcRobotController
Returning null in a function provided to telemetry.addData causes NPE
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Description
Calling `telemetry.addData("foo", () -> null);` in an OpMode will cause a NullPointerException at `org.firstinspires.ftc.robotcore.internal.opmode.TelemetryImpl$Value.compose(TelemtryImpl.java:134)` when telemetry is being updated.
The decompiled code doesn't make the reason immediately obvious.
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