When parseCpuFrequencies returns an empty vector, getCpuFrequency would attempt to dereference an invalid iterator. Return early from getCpuFrequency when parseCpuFrequencies returns an empty vector. Resolves a segfault when waybar is run within a VM on apple silicon.  | 
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| .. | ||
| bsd.cpp | ||
| common.cpp | ||
| linux.cpp | ||