fix(server): saving revision of note with empty title not supported (closes #6103)

apps/server/src/becca/entities/brevision.spec.ts

@@ -0,0 +1,22 @@
+import BRevision from "./brevision.js";
+
+describe("Revision", () => {
+    it("handles note with empty title properly", () => {
+        const revision = new BRevision({
+            revisionId: "4omM5OvlLhOw",
+            noteId: "WHMg7iFCRG3Z",
+            type: "text",
+            mime: "text/html",
+            isProtected: false,
+            title: "",
+            blobId: "",
+            dateLastEdited: "2025-06-27 14:10:39.688+0300",
+            dateCreated: "2025-06-27 14:10:39.688+0300",
+            utcDateLastEdited: "2025-06-27 14:10:39.688+0300",
+            utcDateCreated: "2025-06-27 14:10:39.688+0300",
+            utcDateModified: "2025-06-27 14:10:39.688+0300"
+        });
+        const pojo = revision.getPojo();
+        expect(pojo.title).toBeDefined();
+    });
+});

apps/server/src/becca/entities/brevision.ts

@@ -192,7 +192,7 @@ class BRevision extends AbstractBeccaEntity<BRevision> {
             type: this.type,
             mime: this.mime,
             isProtected: this.isProtected,
-            title: this.title || undefined,
+            title: this.title,
             blobId: this.blobId,
             dateLastEdited: this.dateLastEdited,
             dateCreated: this.dateCreated,
@@ -211,10 +211,10 @@ class BRevision extends AbstractBeccaEntity<BRevision> {
 
         if (pojo.isProtected) {
             if (protectedSessionService.isProtectedSessionAvailable()) {
-                pojo.title = protectedSessionService.encrypt(this.title) || undefined;
+                pojo.title = protectedSessionService.encrypt(this.title) ?? "";
             } else {
                 // updating protected note outside of protected session means we will keep original ciphertexts
-                delete pojo.title;
+                pojo.title = "";
             }
         }