[cli] require '-' to read from stdin if there are other file arguments
[cli] require '-' to read from stdin if there are other file arguments

sureshsundriyal/lnav,tstack/lnav,tstack/lnav,tstack/lnav,sureshsundriyal/lnav,sureshsundriyal/lnav,sureshsundriyal/lnav,tstack/lnav