Avoid 2nd potential XQuery trigger leak

We may leak trigger states to thread local which can potentially occur when
the specified XQueryTrigger library module is not available in the database

Closes eXist-db#5459

exist-core/src/main/java/org/exist/collections/triggers/XQueryTrigger.java

@@ -407,6 +407,7 @@ private void execute(final TriggerPhase phase, final TriggerEvent event, final D
 			compiledQuery = getScript(broker, transaction);
 			if (compiledQuery == null) {
 				// NOTE: can occur if there is no such XQueryTrigger library module available in the database
+				TriggerStatePerThread.clearIfFinished(phase);
 				return;
 			}
 		} catch (final TriggerException e) {