Little bit of refactoring

src/main/java/io/github/thebusybiscuit/slimefun4/core/guide/SlimefunGuide.java

@@ -82,10 +82,6 @@ public final class SlimefunGuide {
 
     @ParametersAreNonnullByDefault
     public static void openCategory(PlayerProfile profile, Category category, SlimefunGuideMode layout, int selectedPage) {
-        if (category == null) {
-            return;
-        }
-
         SlimefunPlugin.getRegistry().getGuideLayout(layout).openCategory(profile, category, selectedPage);
     }
 
@@ -110,8 +106,12 @@ public final class SlimefunGuide {
         SlimefunPlugin.getRegistry().getGuideLayout(SlimefunGuideMode.SURVIVAL_MODE).displayItem(profile, item, addToHistory);
     }
 
-    public static boolean isGuideItem(@Nonnull ItemStack item) {
+    public static boolean isGuideItem(@Nullable ItemStack item) {
-        return SlimefunUtils.isItemSimilar(item, getItem(SlimefunGuideMode.SURVIVAL_MODE), true) || SlimefunUtils.isItemSimilar(item, getItem(SlimefunGuideMode.CHEAT_MODE), true);
+        if (item == null) {
+            return false;
+        } else {
+            return SlimefunUtils.isItemSimilar(item, getItem(SlimefunGuideMode.SURVIVAL_MODE), true) || SlimefunUtils.isItemSimilar(item, getItem(SlimefunGuideMode.CHEAT_MODE), true);
+        }
     }
 
     /**

src/main/java/io/github/thebusybiscuit/slimefun4/core/networks/cargo/CargoUtils.java

@@ -393,19 +393,6 @@ final class CargoUtils {
         }
     }
 
-    /**
-     * Get the whitelist/blacklist slots in a Cargo Input Node. If you wish to access the items
-     * in the cargo (without hardcoding the slots in case of change) then you can use this method.
-     * 
-     * @deprecated Renamed to {@link #getFilteringSlots()}
-     *
-     * @return The slot indexes for the whitelist/blacklist section.
-     */
-    @Deprecated
-    public static int[] getWhitelistBlacklistSlots() {
-        return getFilteringSlots();
-    }
-
     /**
      * Gets the {@link ItemFilter} slots for a Cargo Node. If you wish to access the items
      * in the cargo (without hardcoding the slots in case of change) then you can use this method.

src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/elevator/ElevatorPlate.java

@@ -136,7 +136,6 @@ public class ElevatorPlate extends SimpleSlimefunItem<BlockUseHandler> {
         ChestMenu menu = new ChestMenu(SlimefunPlugin.getLocalization().getMessage(p, "machines.ELEVATOR.pick-a-floor"));
         menu.setEmptySlotsClickable(false);
 
-        int pages = 1 + (floors.size() / GUI_SIZE);
         int index = GUI_SIZE * (page - 1);
 
         for (int i = 0; i < Math.min(GUI_SIZE, floors.size() - index); i++) {
@@ -162,6 +161,8 @@ public class ElevatorPlate extends SimpleSlimefunItem<BlockUseHandler> {
             // @formatter:on
         }
 
+        int pages = 1 + (floors.size() / GUI_SIZE);
+
         // 0 index so size is the first slot of the last row.
         for (int i = GUI_SIZE; i < GUI_SIZE + 9; i++) {
             if (i == GUI_SIZE + 2 && pages > 1 && page != 1) {