Fix NullPointerException when upgrade from 2.x

HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java

@@ -135,6 +135,11 @@ public final class LauncherHelper {
         if (java.getParsedVersion() < JavaVersion.JAVA_8) {
             MessageBox.show(Main.i18n("launch.advice.newer_java"));
         }
+
+        if (java.getParsedVersion() >= JavaVersion.JAVA_9) {
+
+        }
+
         if (java.getPlatform() == org.jackhuang.hmcl.util.Platform.BIT_32 &&
                 org.jackhuang.hmcl.util.Platform.IS_64_BIT) {
             MessageBox.show(Main.i18n("launch.advice.different_platform"));

HMCL/src/main/java/org/jackhuang/hmcl/setting/Profile.java

@@ -64,6 +64,8 @@ public final class Profile {
     }
 
     public void setGlobal(VersionSetting global) {
+        if (global == null)
+            global = new VersionSetting();
         globalProperty.set(global);
     }