Clocktable creates superfluous columns

[Stefan Nobis <stefan-ml@snobis.de>]

Hi.

In version 9.0.5 Org (Emacs 25.1) seems to generate too many columns
in some situations. I'm not quite sure since which version this
happens, in Org 8.x I have not seen this behaviour.

Here is a small example:

--8<---------------cut here---------------start------------->8---
#+BEGIN: clocktable :maxlevel 3 :scope file :narrow 80! :compact
#+CAPTION: Clock summary at [2017-02-18 Sat 12:37], for February 2017.
| Headline          |   Time |   |   |
|-------------------+--------+---+---|
| *Total time*      | *0:15* |   |   |
|-------------------+--------+---+---|
| Some Tasks        |   0:15 |   |   |
| \_  STARTED Task1 |   0:15 |   |   |
#+END:

* Some Tasks
** STARTED Task1
   :CLOCK:
   CLOCK: [2017-02-18 Sat 12:00]--[2017-02-18 Sat 12:15] =>  0:15
   :END:
--8<---------------cut here---------------end--------------->8---

It seems that the iteration over the items generates to many "|". And
top level headlines (e.g. "Some Tasks") each generate one more "|"
than their children (but even those seem to generate to many "|").

I did not fully understand the function org-clocktable-write-default,
so I'm not quite sure how to best fix this.

-- 
Until the next mail...,
Stefan.