Fix error in footer when no collection exists

Footer was using `collection_creation_date_string` which computes the date and calls strftime. New version correctly uses `collection_creation_date` which takes care of the "Never" case.

Author: billdueber

app/views/shared/_footer.html.erb

@@ -36,10 +36,10 @@
       and the
       <a href="https://www.lib.umich.edu/library-administration/library-copyright-statement">U-M Library Copyright
         Policy</a>.
-      Data last refreshed <%= if Dromedary::Services[:looks_like_first_upload] or  Dromedary.collection_creation_date_string =~ /never/i
+      Data last refreshed <%= if Dromedary::Services[:looks_like_first_upload]
                                 "never"
                               else
-                                Dromedary.collection_creation_date_string
+                                Dromedary.collection_creation_date
                               end
     %>.
     </p>

config/load_local_config.rb

@@ -40,7 +40,7 @@ def hyp_to_bibid
     end
 
     def collection_creation_date
-      Rails.logger.warn "################# Fetching creation date ########################"
+      Rails.logger.debug "################# Fetching creation date ########################"
       collection = Dromedary::Services[:solr_current_collection]
       if collection
         Dromedary.compute_collection_creation_date collection.collection.name