Merge pull request SORMAS-Foundation#2741 from john1496/feature-link-event-to-case-#2684

solved Linking a case to an event breaks when there is no event in the db issue SORMAS-Foundation#2684

Author: MateStrysewske

sormas-backend/src/main/java/de/symeda/sormas/backend/contact/ContactFacadeEjb.java

@@ -927,6 +927,7 @@ public Contact fromDto(@NotNull ContactDto source) {
 				target.setCreationDate(new Timestamp(source.getCreationDate().getTime()));
 			}
 		}
+
 		DtoHelper.validateDto(source, target);
 
 		target.setCaze(caseService.getByReferenceDto(source.getCaze()));

sormas-backend/src/main/java/de/symeda/sormas/backend/event/EventParticipantFacadeEjb.java

@@ -115,7 +115,7 @@ public List<EventParticipantDto> getAllEventParticipantsByEventAfter(Date date,
 	}
 
 	@Override
-	public List<String> getAllActiveUuids() {
+	public List<String>  getAllActiveUuids() {
 		User user = userService.getCurrentUser();
 
 		if (user == null) {

sormas-ui/src/main/java/de/symeda/sormas/ui/caze/eventLink/EventListComponent.java

@@ -28,7 +28,9 @@
 import com.vaadin.ui.VerticalLayout;
 import com.vaadin.ui.themes.ValoTheme;
 
+import de.symeda.sormas.api.FacadeProvider;
 import de.symeda.sormas.api.caze.CaseReferenceDto;
+import de.symeda.sormas.api.event.EventCriteria;
 import de.symeda.sormas.api.i18n.Captions;
 import de.symeda.sormas.api.i18n.I18nProperties;
 import de.symeda.sormas.api.i18n.Strings;
@@ -44,7 +46,19 @@ public class EventListComponent extends VerticalLayout {
 
 	public EventListComponent(CaseReferenceDto caseRef) {
 
-		createEventListComponent(new EventList(caseRef), e -> ControllerProvider.getEventController().selectOrCreateEvent(caseRef));
+		createEventListComponent(new EventList(caseRef), e -> {
+
+			EventCriteria eventCriteria = new EventCriteria();
+
+			//check if there are active events in the database
+			long events = FacadeProvider.getEventFacade().count(eventCriteria);
+			if (events > 0) {
+				ControllerProvider.getEventController().selectOrCreateEvent(caseRef);
+			} else {
+				ControllerProvider.getEventController().create(caseRef);
+			}
+		});
+
 	}
 
 	private void createEventListComponent(EventList eventList, Button.ClickListener clickListener) {