Fix errors for pre spigot chat lib update

Author: sandtechnology

src/main/java/org/maxgamer/quickshop/chat/platform/minedown/BungeeQuickChat.java

@@ -430,6 +430,7 @@ public ComponentBuilder color(net.md_5.bungee.api.ChatColor color) {
         private ComponentBuilder append(BaseComponent component, ComponentBuilder.FormatRetention retention) {
             if (!isUsingResetCommitVersion) {
                 builder.append(component, retention);
+                return builder;
             }
 
             List<BaseComponent> parts = builder.getParts();