added check for empty seach

lib/beermapping_api.rb

@@ -1,6 +1,10 @@
 class BeermappingApi
   def self.places_in(city)
     city = city.downcase
+
+    # gets caught by places.empty?
+    # TODO fix error message, No locations in ""
+    return "" if city == ""
     Rails.cache.fetch(city, expires_in: 1.week) { get_places_in city }
   end