Fixes "Module Ads Search requires at least one additional module to be enabled: Ads Search via DB or Ads Search Solr." when enabling "ads_search_db" or "ads_search_solr" modules first time without enabling "ads_search" module
refs https://github.com/mycognitive/ads/issues/12
Merge pull request #13 from nseam/master

Fixes "Module Ads Search requires at least one additional module to be e...