Fix segmentation fault in GetMagnitudeWeightFactor #2053

Job	Run time
Lint	46s
macOS 12 native [GOAL install] [GUI] [no depends]	7m 19s
ARM [GOAL install] [buster]	2m 50s
Win32	3m 18s
Win64	4m 38s
i386 Linux [GOAL install] [focal]	2m 13s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	16m 5s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	15m 52s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	5m 20s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	3m 19s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	3m 19s
	1h 4m 59s

Provide feedback