fix Material.AIR error...

Signed-off-by: 502647092 <jtb1@163.com>

src/main/java/cn/citycraft/EquipManager/runnable/ArmorHandlerTask.java

@@ -17,6 +17,8 @@ public class ArmorHandlerTask implements Runnable {
 			return;
 		ItemStack[] armors = p.getInventory().getArmorContents();
 		for (ItemStack armor : armors) {
+			if (armor == null || armor.getType() == Material.AIR)
+				continue;
 			String armorperm = "em." + armor.getType().toString().toLowerCase();
 			if (!p.hasPermission(armorperm) && !p.isOp() && !p.hasPermission("em.*")) {
 				p.getInventory().addItem(armor);