glib: Make sure that empty glib::StrV / glib::PtrSlice returns a valid pointer
#1734
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…valid pointer Instead of returning `NULL` make sure to return a valid pointer that dereferences into a `NULL`-pointer. Fixes gtk-rs#1733
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Instead of returning
NULLmake sure to return a valid pointer that dereferences into aNULL-pointer.Fixes #1733