added check for return value to linux version of ofLaunchBrowser to avoid warning
added check for return value to linux version of ofLaunchBrowser to avoid warning

HellicarAndLewis/ProjectDonk,HellicarAndLewis/ProjectDonk,HellicarAndLewis/ProjectDonk,HellicarAndLewis/ProjectDonk,HellicarAndLewis/ProjectDonk,HellicarAndLewis/ProjectDonk