Partially broken power connection cable (that goes to the logic board)

Hello,

as I was cleaning the dust off my old late 2009 mac mini I accidentally broke the lower part of the casing shell on the cable that goes from the power button down to the logic board. I managed to pretty firmly attach the two wires correctly to the board and the machine works fine.

My worry is;

1) If the dust buildup could cause a short with that little opening without the shell (see the two metal cable ends of the two wires without the casing shell)

2) Could I easily cover it with something like electrical tape, although the common understanding is that electrical tapes are not ideal for this task (heat & the gooey adhesive they leave behind).

What would be the ideal solution if you think I should cover up the remaining part of the partially broken casing shell on the cable?

Thanks in advance!