Fix empty ssh key importing in ldap (#5984)

models/user.go

@@ -1501,11 +1501,14 @@ func synchronizeLdapSSHPublicKeys(usr *User, s *LoginSource, SSHPublicKeys []str
 	// Get Public Keys from LDAP and skip duplicate keys
 	var ldapKeys []string
 	for _, v := range SSHPublicKeys {
-		ldapKey := strings.Join(strings.Split(v, " ")[:2], " ")
+		sshKeySplit := strings.Split(v, " ")
+		if len(sshKeySplit) > 1 {
+			ldapKey := strings.Join(sshKeySplit[:2], " ")
 			if !util.ExistsInSlice(ldapKey, ldapKeys) {
 				ldapKeys = append(ldapKeys, ldapKey)
 			}
 		}
+	}
 
 	// Check if Public Key sync is needed
 	if util.IsEqualSlice(giteaKeys, ldapKeys) {