Fix crash with Damage Indicators mod and Butterflies

src/main/java/forestry/lepidopterology/entities/EntityButterfly.java

@@ -317,7 +317,7 @@ public class EntityButterfly extends EntityCreature implements IEntityButterfly
 	@Override
 	public String getCommandSenderName() {
 		if (species == null) {
-			return null;
+			return super.getCommandSenderName();
 		}
 		return species.getName();
 	}