Ad requirement 4

I have no idea how this requirement shall be implemented at the end, but at first step, the tiss_crawler.rb lib checks if the search_term is an empty string and returns an error msg if found

otherwise it returns the result, but appended to 'content' key

lib/tiss/tiss_crawler.rb

@@ -10,10 +10,15 @@ class TissCrawler
     search_parameter = params[:search_parameter]
     search_term = params[:search_term].parameterize(separator: '+')
     url = host + api + '?' + search_parameter + '=' + search_term
-    puts(url)
+    puts('generated url:', url)
+
+    if search_term == ""
+      {'error': 'Dare you try! Empty searches are not allowed!'}
+    else
+      response = HTTParty.get(url)
+      {'content': JSON.parse(response.body)['results']}
+    end
 
-    response = HTTParty.get(url)
-    JSON.parse(response.body)['results']
   end
 
   def self.get_details(params)