AP_Scripting: ensure that all pass by reference values are initialized #35723

Job	Run time
build (stm32f7, chibios, 10)	14m 34s
build (stm32h7, chibios, 10)	12m 51s
build (fmuv2-plane, chibios, 10)	5m 55s
build (periph-build, chibios, 10)	19m 5s
build (iofirmware, chibios, 10)	2m 27s
build (CubeOrange-bootloader, chibios, 10)	1m 17s
build (fmuv3-bootloader, chibios, 10)	1m 26s
build (revo-bootloader, chibios, 10)	1m 11s
build (stm32h7-debug, chibios, 10)	7m 0s
build (fmuv3, chibios, 10)	13m 40s
build (revo-mini, chibios, 10)	10m 26s
build (MatekF405-Wing, chibios, 10)	11m 4s
build (CubeOrange-ODID, chibios, 10)	8m 15s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 29s
build (configure-all, chibios, 10)	9m 26s
build (build-options-defaults-test, chibios, 10)	20m 24s
build (signing, chibios, 10)	9m 47s
build (CubeOrange-PPP, chibios, 10)	6m 44s
build (CubeOrange-SOHW, chibios, 10)	7m 27s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 41s
	2h 48m 9s

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