rabbit_khepri: Fix error handling with net_adm:ping/1
#9929
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Why
The initial implementation was a bit too optimistic: it just asserted that
net_adm:ping/1
returned pong. This led to a crash if it was not the case.How
It is better to handle an error from
net_adm:ping/1
and return something appropriate instead of crashing. The rest of the function already does that.It improves the integration with peer discovery.