[PostGIS] #6111: Don't run test_check_news.py when not using git

[PostGIS]

#6111: Don't run test_check_news.py when not using git
-----------------------------+---------------------------
  Reporter:  Bas Couwenberg  |      Owner:  robe
      Type:  defect          |     Status:  new
  Priority:  medium          |  Milestone:  PostGIS 3.7.0
 Component:  documentation   |    Version:  master
Resolution:                  |   Keywords:
-----------------------------+---------------------------
Changes (by Bas Couwenberg):

 * Attachment "test-doc.patch" added.

 Patch fixing the issue
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/6111>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.