Fix HttpParty deprecation [DEPRECATION] HTTParty will no longer overr…

…ide `response#nil?`. This functionality will be removed in future versions. Please, add explicit check `response.body.nil? || response.body.empty?`. For more info refer to: jnunemaker/httparty#568

lib/quick_travel/cache.rb

@@ -11,13 +11,20 @@ def self.cache(key, cache_options = nil)
       cache_options ||= {}
       key = "#{@@namespace}_#{key}" unless cache_options[:disable_namespacing]
       cached_value = cache_store.read(key)
-      return cached_value unless cached_value.nil?
+      return cached_value unless cache_empty?(cached_value)
       return nil unless block_given?
       cache_options ||= {}
       cache_options[:expires_in] = 1.day unless cache_options.key?(:expires_in)
       yield.tap { |value| cache_store.write(key, value, cache_options) }
     end
 
+    def self.cache_empty?(cached_value)
+      if cached_value.respond_to?(:body)
+        return cached_value.body.nil? || cached_value.body.empty?
+      end
+      cached_value.nil?
+    end
+
     def self.delete(key, namespace = true)
       key = "#{@@namespace}_#{key}" if namespace
       cache_store.delete(key)