Explaining what John says in a slightly different way:
The current that a PV (solar) panel produces in full sunlight at its maximum power point is termed Imp.
The current that a PV (solar) panel produces in full sunlight when short circuited is termed Isc.
The increase in current from Imp to Isc is typically about 10%. eg if a panel makes maximum power when current = 10A, then shorting the panel into a zero Ohm load will produce about 10 + 10% = 11A.
The increase from Imp to Isc is so small that there is no difference hazard wise. For example, if a wiring run droppeed 1 Volt at 10A then the power lost would be P = I x V = 10 x 1 = 10 Watt.
At 11A the voltage drop would be 1.1 Volt and the power lost would be
I x V = 11 x 1.1 = 12.1 Watt. The extra 21% loss of 2.1 Watts would be spread over many metres of cable and would make no noticeable difference to heating - or any other aspect.
So - fusing at the panel end is not needed as I_short_circuit is hardly more than I_maximum_operating.