[aur-general] pacman 4.1 (makepkg 4.1) git pkgver autobump problem

[Tai-Lin Chu]

 The problem:
according to archwiki, to autobump pkgver, pkgver should be empty and
pkgver() is provided.
However, if we package it, the version number is empty, so AUR wont accept it.

The Question:
1. is it a bug?
2. should aur be updated to allow empty pkgver?

My idea:
if pkgver=AUTO, then pkgver() must be provided and it will be called.
otherwise, pkgver must be valid version number.