fix banner symlink condition

gga_init.py

@@ -67,6 +67,8 @@ class DeploySpeciesStack(speciesData.SpeciesData):
                 if not os.path.isfile(banner_dest_path) and not os.path.islink(banner_dest_path):
                     os.symlink(os.path.abspath(self.config[constants.CONF_TRIPAL_BANNER_PATH]), banner_dest_path)
                     logging.info("Custom banner added: symlink from %s" % self.config[constants.CONF_TRIPAL_BANNER_PATH])
+                else:
+                    logging.info("Banner already exists at %s. The banner defined in config is not added." % banner_dest_path)
             else:
                 logging.debug("Using default banner for Tripal pages because %s is not valid in 'config' file" % constants.CONF_TRIPAL_BANNER_PATH)
                 self.config.pop(constants.CONF_TRIPAL_BANNER_PATH, None)