Battery voltage isn't sent to the Driver Station when telemetry is blank

If there are no data or lines present in telemetry then the robot's battery voltage is never sent to the Driver Station. Adding anything to telemetry fixes the issue. The issue stems from [line 750 of TelemetryImpl.java](https://github.com/OpenFTC/Extracted-RC/blob/11.0/RobotCore/src/main/java/org/firstinspires/ftc/robotcore/internal/opmode/TelemetryImpl.java#L750) where the telemetry is only updated if there are some data or lines present to send. A minimal example is provided below that demonstrates the issue.
```java
import com.qualcomm.robotcore.eventloop.opmode.*;

public class BatteryTelemetryTest {
@TeleOp
public static class BatteryVoltageWorks extends OpMode {
@Override
public void init() {}

@Override
public void loop() {
telemetry.addLine("Telemetry to make battery voltage send");
}
}

@TeleOp
public static class BatteryVoltageBroken extends OpMode {
@Override
public void init() {}

@Override
public void loop() {}
}
}
```

Start in RobotCore/src/main/java/org/firstinspires/ftc/robotcore/internal/opmode/TelemetryImpl.java at line 750, then run the minimal BatteryVoltageBroken and BatteryVoltageWorks examples from the issue. Done means the Driver Station receives battery voltage when telemetry has no data or lines, while the existing behavior with telemetry content still works.

Written by the indexing model from the issue text.