Validate email and don't add it if empty #245

Job	Run time
settings (3.8)	4m 37s
settings (3.11)	3m 57s
server (ubuntu-latest, 3.8)	9m 35s
server (ubuntu-latest, 3.11)	9m 22s
server (macos-latest, 3.8)	15m 21s
server (macos-latest, 3.11)	14m 58s
server (windows-latest, 3.8)	16m 44s
server (windows-latest, 3.11)	18m 21s
no-tests (3.11)	3m 5s
names (my_extension, my_extension)	3m 43s
names (myextension, myextension)	4m 23s
names (my-extension, my_extension)	3m 45s
mimerenderer (3.8)	3m 47s
mimerenderer (3.11)	3m 37s
pnpm_linker (frontend)	2m 6s
pnpm_linker (server)	2m 3s
pnpm_linker (theme)	2m 28s
theme (3.8)	4m 30s
theme (3.11)	4m 35s
test_isolated (3.8)	1m 20s
test_isolated (3.11)	54s
	2h 13m 11s

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