certs: mark SAN as critical if no CN is set, fix #3981
certs: mark SAN as critical if no CN is set, fix #3981

mhils/mitmproxy,mitmproxy/mitmproxy,Kriechi/mitmproxy,mhils/mitmproxy,mhils/mitmproxy,vhaupert/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,Kriechi/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,vhaupert/mitmproxy,vhaupert/mitmproxy,Kriechi/mitmproxy,vhaupert/mitmproxy,mitmproxy/mitmproxy