restore None for empty filter
restore None for empty filter

arq5x/gemini,brentp/gemini,bpow/gemini,bpow/gemini,bpow/gemini,udp3f/gemini,bgruening/gemini,brentp/gemini,bpow/gemini,bgruening/gemini,brentp/gemini,brentp/gemini,bgruening/gemini,xuzetan/gemini,udp3f/gemini,udp3f/gemini,udp3f/gemini,xuzetan/gemini,arq5x/gemini,arq5x/gemini,xuzetan/gemini,bgruening/gemini,xuzetan/gemini,arq5x/gemini