fix memory card not saving fluids an level emitters

src/main/java/appeng/fluids/helper/IConfigurableFluidInventory.java

@@ -0,0 +1,11 @@
+package appeng.fluids.helper;
+
+import net.minecraftforge.fluids.capability.IFluidHandler;
+
+public interface IConfigurableFluidInventory
+{
+    default IFluidHandler getFluidInventoryByName( String name )
+    {
+        return null;
+    }
+}