Fixed bug where shift right clicking potion ingredients was broken

src/main/java/com/gmail/nossr50/listeners/InventoryListener.java

@@ -183,7 +183,10 @@ public class InventoryListener implements Listener {
                         return;
                     }
 
-                    AlchemyPotionBrewer.transferItems(event.getView(), event.getRawSlot(), click);
+                    if (!AlchemyPotionBrewer.transferItems(event.getView(), event.getRawSlot(), click)) {
+                        return;
+                    }
+
                     event.setCancelled(true);
                     AlchemyPotionBrewer.scheduleUpdate(inventory);
                     AlchemyPotionBrewer.scheduleCheck(player, stand);

src/main/java/com/gmail/nossr50/skills/alchemy/AlchemyPotionBrewer.java

@@ -161,7 +161,7 @@ public final class AlchemyPotionBrewer {
             }
 
             from.setAmount(fromAmount - 1);
-            view.setItem(Alchemy.INGREDIENT_SLOT, emptyTo ? null : to);
+            view.setItem(Alchemy.INGREDIENT_SLOT, to);
             view.setItem(fromSlot, from);
 
             return true;