Fix NullPointerException, when console process dies while reading inp…

…ut from it

src/main/java/com/stirante/lolclient/SimpleConsole.java

@@ -33,7 +33,7 @@ public SimpleConsole(String executable) {
     @Override
     public void run() {
         while (running.get()) {
-            while (running.get() && cmdOutput.hasNextLine()) {
+            while (running.get() && process.isAlive() && cmdOutput.hasNextLine()) {
                 String s = cmdOutput.nextLine();
                 LISTENERS_LOCK.lock();
                 listeners.removeIf(stringBooleanFunction -> stringBooleanFunction.apply(s));