Avoid potential crash on signal disconnection #832

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 1s
🤖 Android / Editor (target=editor)	24m 29s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	17m 18s
🍏 iOS / Template (target=template_release)	10m 59s
🍎 macOS / Editor (target=editor, tests=yes)	19m 40s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	17m 22s
🐧 Linux / Editor w/ Mono (target=editor)	39m 29s
🍎 macOS / Template (target=template_release)	10m 29s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	39m 29s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	40m 22s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	23m 47s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	32m 32s
🌐 Web / Template w/o threads (target=template_release, threads=no)	23m 2s
🏁 Windows / Editor (target=editor, tests=yes)	48m 42s
🐧 Linux / Template w/ Mono (target=template_release)	26m 21s
🏁 Windows / Template (target=template_release)	37m 4s
🐧 Linux / Minimal template (target=template_release, everything disabled)	16m 43s
🪲 Godot CPP	0s
	7h 8m 49s

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