Merge branch 'master' into architecture-doc-update-aleksi

Author: mikkomaa

src/main/java/fi/helsinki/cs/tmc/cli/command/SubmitCommand.java

@@ -108,8 +108,12 @@ public void run(CommandLine args, Io io) {
             SubmissionResult result = TmcUtil.submitExercise(ctx, exercise);
             if (result == null) {
                 io.println("Submission failed.");
-                resultPrinter.addFailedExercise();
-                continue;
+                if (!isOnlyExercise) {
+                    io.println("Try to submit exercises one by one.");
+                }
+                return;
+                //resultPrinter.addFailedExercise();
+                //continue;
             }
 
             resultPrinter.printSubmissionResult(result, isOnlyExercise);

src/main/java/fi/helsinki/cs/tmc/cli/tmcstuff/TmcUtil.java

@@ -205,7 +205,8 @@ protected static void handleTmcExceptions(CliContext ctx, Exception exception) {
             io.println("Your tmc-cli is outdated. Please update it.");
             return;
         }
-        io.println("Failed to connect to server.");
+        logger.error("Command failed in tmc-core", exception);
+        io.println("Command failed in tmc-core, check tmc-cli.log file for more info");
     }
 
     private static boolean isAuthenticationError(Exception exception) {