Fixed NPE due to null itemShareMode

src/main/java/com/gmail/nossr50/party/Party.java

@@ -12,8 +12,8 @@ public class Party {
     private String name;
     private String password;
     private boolean locked;
-    private ShareHandler.ShareMode xpShareMode;
-    private ShareHandler.ShareMode itemShareMode;
+    private ShareHandler.ShareMode xpShareMode = ShareHandler.ShareMode.NONE;
+    private ShareHandler.ShareMode itemShareMode = ShareHandler.ShareMode.NONE;
 
     public List<OfflinePlayer> getMembers() {
         return members;

src/main/java/com/gmail/nossr50/party/PartyManager.java

@@ -260,7 +260,6 @@ public final class PartyManager {
 
             party.setName(partyName);
             party.setLeader(player.getName());
-            party.setXpShareMode(ShareHandler.ShareMode.NONE);
             party.setLocked(true); // Parties are now invite-only by default, can be set to open with /party unlock
 
             if (password != null) {