Fix warnings when no release data is found

[minorOffense]

Warning: get_class() expects parameter 1 to be object, string given in FeatureServerProjectXMLFormatter->render() (line 10 of /var/www/html/app/profiles/dropfort_profile/modules/custom/fserver/fserver_services/fserver_services.inc).
Jun 18 06:14:17 local drupal: http://localhost|1403097257|php|::1|http://localhost/fserver/release-history/views/7.x||0||Warning: Unknown class passed as parameter in FeatureServerProjectXMLFormatter->render() (line 10 of /var/www/html/app/profiles/dropfort_profile/modules/custom/fserver/fserver_services/fserver_services.inc).
Jun 18 06:14:17 local drupal: http://localhost|1403097257|php|::1|http://localhost/fserver/release-history/views/7.x||0||Warning: get_class() expects parameter 1 to be object, string given in FeatureServerProjectXMLFormatter->render() (line 10 of /var/www/html/app/profiles/dropfort_profile/modules/custom/fserver/fserver_services/fserver_services.inc).
Jun 18 06:14:17 local drupal: http://localhost|1403097257|php|::1|http://localhost/fserver/release-history/views/7.x||0||Warning: Unknown class passed as parameter in FeatureServerProjectXMLFormatter->render() (line 10 of /var/www/html/app/profiles/dropfort_profile/modules/custom/fserver/fserver_services/fserver_services.inc).

[minorOffense]

This should be simple enough to figure out by just reading the code. Add an is_object or isset somewhere.

[frederickjh]

Warning: get_class() expects parameter 1 to be object, string given in FeatureServerProjectXMLFormatter->render() (line 10 of /var/www/html/app/profiles/dropfort_profile/modules/custom/fserver/fserver_services/fserver_services.inc).

This error is also in #47 and in #39