is_callsign(): Check size of callsign before indexing into it#29
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This was causing some crashes for me when I would see this parsing my logs on startup.
This would see a callsign like ANAAA/2 (where "A" is a letter, and "N" a number), splitting the callsign and checking if each part was a callsign with
is_callsign().So when it'd be called like
is_callsign("2"), it'd crash with callingcallsign.at(1)