Check required config param are not empty

constants.py

@@ -54,3 +54,6 @@ DELETE_ORGANISMS_TOOL = "toolshed.g2.bx.psu.edu/repos/gga/chado_organism_delete_
 
 HOST_DATA_DIR='src_data'
 CONTAINER_DATA_DIR_ROOT='/project_data'
+
+REQUIRED_PARAMETERS = [CONF_ALL_HOSTNAME, CONF_ALL_HTTP_PORT, CONF_GALAXY_DEFAULT_ADMIN_EMAIL, CONF_GALAXY_DEFAULT_ADMIN_USER, 
+					   CONF_GALAXY_DEFAULT_ADMIN_PASSWORD, CONF_TRIPAL_PASSWORD, CONF_GALAXY_CONFIG_REMOTE_USER_MAILDOMAIN]