fix reactive errors (null exception)

Author: Thomasr

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/application/model/Application.java

@@ -137,11 +137,9 @@ public Mono<ApplicationQuery> getQueryByViewModeAndQueryId(boolean isViewMode, S
     @Transient
     @JsonIgnore
     public Mono<Map<String, Object>> getLiveApplicationDsl(ApplicationRecordService applicationRecordService) {
-        return applicationRecordService.getLatestRecordByApplicationId(this.getId()).map(applicationRecord -> {
-            Map<String, Object> dsl = applicationRecord == null ? editingApplicationDSL : applicationRecord.getApplicationDSL();
-            if(dsl == null) dsl = new HashMap<>();
-            return dsl;
-        });
+        return applicationRecordService.getLatestRecordByApplicationId(this.getId())
+                .map(ApplicationRecord::getApplicationDSL)
+                .switchIfEmpty(Mono.just(editingApplicationDSL));
     }
 
     public String getOrganizationId() {

server/api-service/lowcoder-domain/src/main/java/org/lowcoder/domain/application/service/ApplicationServiceImpl.java

@@ -141,7 +141,7 @@ public Mono<List<Application>> getAllDependentModulesFromApplicationId(String ap
 
     @Override
     public Mono<List<Application>> getAllDependentModulesFromApplication(Application application, boolean viewMode) {
-        return application.getLiveApplicationDsl(applicationRecordService).flatMap(liveApplicationDsl -> {
+        return application.getLiveApplicationDsl(applicationRecordService).switchIfEmpty(Mono.just(new HashMap<>())).flatMap(liveApplicationDsl -> {
             Map<String, Object> dsl = viewMode ? liveApplicationDsl : application.getEditingApplicationDSL();
             return getAllDependentModulesFromDsl(dsl);
         });