running `valadoc` without arguments crashes
> valadoc
error: No output directory specified.
Failed: 1 error(s), 0 warning(s)
(valadoc:61081): vala-ERROR **: 19:59:59.739: valacodecontext.vala:285: internal: No context available to pop
fish: “valadoc” terminated by signal SIGTRAP (Trace or breakpoint trap)
valadoc --version
Valadoc 0.49.90.4-20ac2