Link and date fields unset in task info

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At some point (sorry for my Arch incompetence) the following change
was made to planner.el:

,----
| @@ -1277,7 +1448,9 @@
|          (setq description (replace-match "" t t description)))
|         ((string-match "\\s-+$" description)
|          (setq description (replace-match "" t t description))))
| -      (and link (setq link (planner-link-base link)))
| +      (when link
| +        (setq link (and (string-match emacs-wiki-name-regexp link-text)
| +                        (planner-link-base link-text))))
|        (unless (planner-local-page-p link) (setq link nil))
|        (if (string-match planner-date-regexp page-name)
|            ;; We're on a date page, so the link page (if any) should be the
`----

When the link is just a date (which wouldn't match
emacs-wiki-name-regexp), this code seems to set link to nil.  Hence,
later on, the date field also gets set to nil.

It could be fixed by making the string-match part of the when
conditional or by also doing a string-match against
planner-date-regexp.  I'm not sure which is the best way.

- -- 
Andrew J. Korty, Principal Security Engineer, GCIA, GCFA
Office of the Vice President for Information Technology
Indiana University
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