#979 some commandline options fail to proceed when qmmp is not running

[kavol]

If qmmp is not running, there is a problem with some commandline options:
* --quit enters an endless wait
* --volume-status, --mute-status, --pl-help, --status, --nowplaying, --nowplaying-syntax just run qmmp instead of printing the information

Note that even using explicit '--no-start' option does not help much - it correctly prevents qmmp from running, but the information isn't printed (while --help, --version and --ui-list print the information).