Fix standalone web UI crash when polling player data before ship sele… #2439

Job	Run time
Linux (Debug, gcc-9)	16m 40s
Linux (Debug, gcc-13)	5m 6s
Linux (Release, gcc-9)	14m 33s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	12m 16s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	11m 29s
Linux (Release, clang-16)	17m 28s
Linux (Debug, clang-16)	10m 24s
Linux (Release, gcc-13)	13m 51s
	1h 41m 47s

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