protection against deleting root note

src/public/javascripts/services/branches.js

@@ -59,6 +59,8 @@ async function moveToNode(nodesToMove, toNode) {
 }
 
 async function deleteNodes(nodes) {
+    nodes = nodes.filter(node => node.data.noteId !== 'root');
+
     if (nodes.length === 0 || !confirm('Are you sure you want to delete select note(s) and all the sub-notes?')) {
         return;
     }

src/services/notes.js

@@ -248,6 +248,10 @@ async function deleteNote(branch) {
         return;
     }
 
+    if (branch.branchId === 'root' || branch.noteId === 'root') {
+        throw new Error("Can't delete root branch/note");
+    }
+
     branch.isDeleted = true;
     await branch.save();
 

src/services/tree.js

@@ -19,7 +19,7 @@ async function validateParentChild(parentNoteId, childNoteId, branchId = null) {
     if (!await checkTreeCycle(parentNoteId, childNoteId)) {
         return {
             success: false,
-            message: 'Moving note here would create cycle.'
+            message: 'Moving/cloning note here would create cycle.'
         };
     }