installation: location of demo_table_jui.css

* Fixes location of demo_table_jui.css by explicitly referencing last
  git tag that contained the file.

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
Merge pull request #1954 from kaplun/fix-install-demo_table_jui

installation: location of demo_table_jui.css
BibDocFile: undefined variable fix

* Fixes internal server error when directories are missing on the
  filesystem.

* Applies fix from 'pu' to 'master'. The fix was overwritten by the recent
  large master to next merge (eefac3e73d8dd5b7c5ac1a47cb298431f4a8662f).

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>