openthread: shell: Do not execute OT commands when OT is not ready

OpenThread shell tries to execute commands without checking
if the shell has already been initialized. As a result, we
may hit an assertion in the OpenThread CLI code. It's
particularly painful in automated tests which spawn commands
very early in the firmware boot process.

Signed-off-by: Damian Krolik <damian.krolik@nordicsemi.no>
1 file changed