Don't show stacktrace to user when login fails

Author: Redande

tmc-plugin/src/fi/helsinki/cs/tmc/tasks/LoginTask.java

@@ -4,7 +4,6 @@
 import fi.helsinki.cs.tmc.utilities.LoginManager;
 import java.util.concurrent.Callable;
 import java.util.logging.Logger;
-import org.openide.util.Exceptions;
 
 public class LoginTask implements Callable<Void> {
     private static final Logger log = Logger.getLogger(LoginTask.class.getName());

tmc-plugin/src/fi/helsinki/cs/tmc/utilities/LoginManager.java

@@ -49,7 +49,6 @@ public void actionPerformed(ActionEvent e) {
                         try {
                             TmcCore.get().authenticate(ProgressObserver.NULL_OBSERVER, TmcSettingsHolder.get().getPassword().get()).call();
                         } catch (Exception ex) {
-                            log.log(Level.WARNING, "Authentication failed!", ex);
                             if (ex instanceof AuthenticationFailedException) {
                                 authenticationException = (AuthenticationFailedException) ex;
                                 ConvenientDialogDisplayer.getDefault().displayError("Username or password is incorrect.", ex);