Remove Log info when no group filter is set, fixes #17921

The log message is superfluous and too noisy. If an admin decides not to use groups, he does not need to be reminded about it on almost every request.

apps/user_ldap/lib/connection.php

@@ -342,12 +342,6 @@ class Connection extends LDAPUtility {
 		}
 
 		$groupFilter = $this->configuration->ldapGroupFilter;
-		if(empty($groupFilter)) {
-			\OCP\Util::writeLog('user_ldap',
-								'No group filter is specified, LDAP group '.
-								'feature will not be used.',
-								\OCP\Util::INFO);
-		}
 
 		foreach(array('ldapExpertUUIDUserAttr'  => 'ldapUuidUserAttribute',
 					  'ldapExpertUUIDGroupAttr' => 'ldapUuidGroupAttribute')