* Additionally, fixes the `NULL` option to `OMPI_MCA_plm_rsh_agent`
would would also lead to a segv. Now it operates as intended by
disqualifying the `rsh` component and falling back onto the `isolated`
component.
Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
(cherry picked from commit 62d0058738e8a111cd099199bc5f1886f13aa8ec)