Address comments

Core/src/main/java/com/plotsquared/core/components/ComponentPresetManager.java

@@ -181,6 +181,10 @@ public class ComponentPresetManager {
             }
             allowedPresets.add(componentPreset);
         }
+        if (allowedPresets.isEmpty()) {
+            player.sendMessage(TranslatableCaption.of("preset.empty"));
+            return null;
+        }
         final int size = (int) Math.ceil((double) allowedPresets.size() / 9.0D);
         final PlotInventory plotInventory = new PlotInventory(this.inventoryUtil, player, size,
                 TranslatableCaption.of("preset.title").getComponent(player)) {

Core/src/main/resources/lang/messages_en.json

@@ -463,6 +463,7 @@
   "preset.preset_lore_cost": "<prefix><gray>Cost: </gray><gold><cost></gold>",
   "preset.preset_lore_component": "<gray>Component: </gray><gold><component></gold>",
   "preset.title": "Plot Components",
+  "preset.empty": "<prefix><red>No plot component presets available.</red>",
   "generic.generic_other": "<gray>other</gray>",
   "generic.generic_merged": "<gray>merged</gray>",
   "generic.generic_unowned": "<gray>unowned</gray>",