What happens when the process bites the dust.
This example shows that sending a message to a non-existent
Pid using gen_server only produces an error if a gen_server:call
function is used. When using gen_server:cast the message is simply
sent into nothingness.
That is why, if you want to make sure the message arrived at its destination,
always use gen_server:call and confirm the receipt with a simple
gen_server:reply(From, ok) in the handler. After which, you can
carry on your processing.