Merge pull request #1409 from lowcoder-org/fix/category_null

Fix fallback issue for category and other settings

Author: FalkWolsky

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

@@ -178,7 +178,7 @@ public Mono<String> getCategory(ApplicationRecordService applicationRecordServic
             } else {
                 return "";
             }
-        });
+        }).onErrorReturn("");
     }
 
     public Mono<String> getTitle(ApplicationRecordService applicationRecordService) {
@@ -192,7 +192,7 @@ public Mono<String> getTitle(ApplicationRecordService applicationRecordService)
             } else {
                 return "";
             }
-        });
+        }).onErrorReturn("");
     }
 
     public Mono<String> getDescription(ApplicationRecordService applicationRecordService) {
@@ -207,7 +207,7 @@ public Mono<String> getDescription(ApplicationRecordService applicationRecordSer
                     return "";
                 }
             }
-        );
+        ).onErrorReturn("");
     }
 
     public Mono<String> getIcon(ApplicationRecordService applicationRecordService) {