Add empty energy storage

src/main/kotlin/ru/dbotthepony/mc/otm/capability/energy/IMatteryEnergyStorage.kt

@@ -200,6 +200,49 @@ interface IMatteryEnergyStorage : IEnergyStorage {
 	override fun canReceive(): Boolean {
 		return energyFlow.input
 	}
+
+	/**
+	 * Companion object of [IMatteryEnergyStorage] represents empty energy storage
+	 */
+	companion object : IMatteryEnergyStorage {
+		override fun extractEnergy(howMuch: Decimal, simulate: Boolean): Decimal {
+			return Decimal.ZERO
+		}
+
+		override fun receiveEnergy(howMuch: Decimal, simulate: Boolean): Decimal {
+			return Decimal.ZERO
+		}
+
+		override var batteryLevel: Decimal
+			get() = Decimal.ZERO
+			set(value) {}
+		override val maxBatteryLevel: Decimal
+			get() = Decimal.ZERO
+		override val energyFlow: FlowDirection
+			get() = FlowDirection.NONE
+
+		override val canSetBatteryLevel: Boolean
+			get() = false
+
+		override val missingPower: Decimal
+			get() = Decimal.ZERO
+
+		override fun drainBattery(): Boolean {
+			return false
+		}
+
+		override fun fillBattery(): Boolean {
+			return false
+		}
+
+		override fun receiveEnergy(maxReceive: Int, simulate: Boolean): Int {
+			return 0
+		}
+
+		override fun extractEnergy(maxReceive: Int, simulate: Boolean): Int {
+			return 0
+		}
+	}
 }
 
 /**