Fix bad commit

slic3r.pl

@@ -75,7 +75,7 @@ Slic3r::Config->set($_ => $cli_options{$_}) for keys %cli_options;
 # validate configuration, convert options like --print-center to arrayrefs, init extruders etc.
 # ignore errors if we're launching the GUI
 eval { Slic3r::Config->validate };
-die $@ unless $gui;
+die $@ if $@ && !$gui;
 
 # save configuration
 Slic3r::Config->save($opt{save}) if $opt{save};