Fix `log` method not logging throwables

bukkit/src/main/java/net/william278/husksync/BukkitHuskSync.java

@@ -265,7 +265,11 @@ public class BukkitHuskSync extends JavaPlugin implements HuskSync {
 
     @Override
     public void log(@NotNull Level level, @NotNull String message, @NotNull Throwable... throwable) {
-        getLogger().log(level, message, throwable);
+        if (throwable.length > 0) {
+            getLogger().log(level, message, throwable[0]);
+        } else {
+            getLogger().log(level, message);
+        }
     }
 
     @NotNull