[Bug fortran/96486] get_environment_variable crashes for environment variables that are empty strings

[markeggleston at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96486

markeggleston at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #32 from markeggleston at gcc dot gnu.org ---
Committed to master and backported to gcc-10 and gcc-9.

For F2018 conformance see PR96583.