HTTParty will no longer override response#nil?

Get rid off the DEPRECATED warning in related to that functionality..

==> graylog: [DEPRECATION] HTTParty will no longer override `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
==> graylog: /tmp/vagrant-puppet/environments/local/local-modules/graylog_api/lib/puppet/provider/graylog_api.rb:109:in `request'
==> graylog: [DEPRECATION] HTTParty will no longer override `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

Author: tahder

lib/puppet/provider/graylog_api.rb

@@ -94,7 +94,7 @@ def request(method, path, params = {})
           **tls_opts
         )
 
-        if result.body
+        if result.body && !result.body.empty?
           if result.body.include? '"type":"ApiError"'
             Puppet.send_log(:err, "Got error response #{result.body}")
             raise
@@ -106,7 +106,7 @@ def request(method, path, params = {})
         Puppet.send_log(:err, "Got error response #{e.response}")
         raise e
       end
-      recursive_nil_to_undef(JSON.parse(result.body)) unless result.nil?
+      recursive_nil_to_undef(JSON.parse(result.body)) if result.body && !result.body.empty?
     end
 
     # Under Puppet Apply, undef in puppet-lang becomes :undef instead of nil