connection: don't check command_list_remaining if not in command list
connection: don't check command_list_remaining if not in command list

The value of command_list_remaining is undefined if
!sending_command_list.

OpenInkpot-archive/iplinux-libmpdclient,jagleeso/libmpdclient,jwise/libmpdclient,jagleeso/libmpdclient,sl0th/libmpdclient,OpenInkpot-archive/iplinux-libmpdclient,cmende/libmpdclient,psych0tik/libmpdclient2,psych0tik/libmpdclient2,sl0th/libmpdclient,cmende/libmpdclient,sl0th/libmpdclient,cmende/libmpdclient,jagleeso/libmpdclient,yusiwen/libmpdclient,jwise/libmpdclient,jwise/libmpdclient,yusiwen/libmpdclient,yusiwen/libmpdclient