keep compatibility and do not generate pdns records/zone when custom zonefile is set

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>

scripts/jobs/cron_tasks.inc.dns.20.pdns.php

@@ -61,6 +61,7 @@ class pdns extends DnsBase
 			$subzones[] = $this->walkDomainList($domains[$child_domain_id], $domains);
 		}
 
+		if ($domain['zonefile'] == '') {
 		// check for system-hostname
 			$isFroxlorHostname = false;
 			if (isset($domain['froxlorhost']) && $domain['froxlorhost'] == 1) {
@@ -88,6 +89,11 @@ class pdns extends DnsBase
 					$isFroxlorHostname,
 					true);
 			}
+		} else {
+			$this->_logger->logAction(CRON_ACTION, LOG_ERROR,
+				'Custom zonefiles are NOT supported when PowerDNS is selected as DNS daemon (triggered by: ' .
+				$domain['domain'] . ')');
+		}
 	}
 
 	private function _clearZoneTables()