Equipment info without SIM installed

[colin.helliwell at ln-systems.com]

I'd like to be able to get the h/w info without a SIM installed, but this
seems to cause modem_load_current_capabilities() to fail (because "AT_CPIN?"
errors). Hence the initialization overall fails.
I haven't yet sussed out exactly which piece of code is catching the error
(when other commands in 'capabilities' also error), but I'm wondering
initially whether/why there's a need for "CPIN?" at this stage?