Empty window at startup about clap-host HOT 2 OPEN

Oh.

>clap-host.exe --help
Usage: clap-host.exe [options]
clap standalone host

Options:
  -?, -h, --help                     Displays help on commandline options.
  --help-all                         Displays help including Qt specific
                                     options.
  -v, --version                      Displays version information.
  -p, --plugin <path>                path to the plugin
  -i, --plugin-index <plugin-index>  index of the plugin to create

_pluginPath was not set in Application::parseCommandLine since I did not use the -p option, which led to trying to load a plugin with an empty path.

I guess some command line validation (displaying usage if a mandatory argument is missing) would be helpful.

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Adding a menu would be a better solution since many problems can also occur after one figures out how to load a plug-in. For me, the asio driver was continuously crashing and there is no way to change that. I finally installed ASIO 4 all and it started working.

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