Bug 32214: Prevent empty search option block in catalog search header

Bug 32214: Prevent empty search option block in catalog search header

In the header, if "Search catalog" is selected, there is an "option"
icon to display some filters.
Fitlers are displayed if IntranetCatalogSearchPulldown or
IntranetAddMastheadLibraryPulldown is set. If none are set we should
hide the icon to avoid and empty div to be displayed

Test plan:
Confirm that the icon is only displayed if one of the 2 prefs is turned
on.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>