Merge pull request #2247 from inoio/fix-ldap

fix broken ldap when custom filter specifies no userId

packages/rocketchat-ldap/server/ldap.js

@@ -142,8 +142,8 @@ LDAP = class LDAP {
 
 			return {
 				filter: custom_domain_search.filter,
-				domain_search_user: custom_domain_search.userDN,
-				domain_search_password: custom_domain_search.password
+				domain_search_user: custom_domain_search.userDN || '',
+				domain_search_password: custom_domain_search.password || ''
 			};
 		}