Fix dangling pointer with an additional map #1458

Job	Run time
Copy the font files	7s
Build ubuntu-20.04-g++-9	4m 34s
Set up and cache emscripten	11s
Build ubuntu-20.04-g++-10	4m 4s
Build ubuntu-20.04-g++-11	4m 14s
Build ubuntu-20.04-clang-6.0	4m 28s
Build ubuntu-20.04-clang-9	4m 16s
Build ubuntu-20.04-clang-12	4m 19s
Build macos-latest-xcode-13.1	6m 34s
Build macos-latest-xcode-14.2	5m 20s
Build macos-11-g++-12	8m 21s
Build JS toolkit (nohumdrum, Building toolkit without humdrum, -c -H -M, verovio-toolkit.js*)	5m 11s
Build JS toolkit (light, Building toolkit without humdrum as light version, -c -H -l -M, verovio-...	5m 23s
Build JS toolkit (wasm, Building toolkit without humdrum as wasm, -c -H -w -M, veroviowasm, true)	4m 22s
Build JS toolkit (default, Building default toolkit with humdrum, -c -M, -hum.js)	6m 34s
Check settings for deployment	1s
Build documentation	2m 32s
Deploy JS toolkit	1m 22s
Deploy documentation	1m 23s
Skip deployment if set	0s
	1h 13m 16s

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