Bug 18582 - Hide empty rows in detailed suggestion view

Bug 18582 - Hide empty rows in detailed suggestion view

This patch adds a check for the existence of various template variables
before showing the row containing that data. This will prevent the
display of rows containing labels but no data in the suggestions
detailed view.

To test, apply the patch and go to Acquisitions -> Suggestions.

View the detail page of various suggestions and confirm that only fields
with data are displaying.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>