fix: handle empty replace term in search and replace functionality (#1562)

- Fix 'Empty text nodes are not allowed' error when replace field is empty
- Update both replace() and replaceAll() functions to check for empty replaceTerm

packages/editor-ext/src/lib/search-and-replace/search-and-replace.ts

@@ -198,9 +198,13 @@ const replace = (
 
     const marks = Array.from(marksSet);
     
-    // Delete the old text and insert new text with preserved marks
+    // Delete the old text
     tr.delete(from, to);
+
+    // Only insert new text if replaceTerm is not empty (allows for deletion when replaceTerm is empty)
+    if (replaceTerm) {
       tr.insert(from, state.schema.text(replaceTerm, marks));
+    }
     
     dispatch(tr);
   }
@@ -229,10 +233,14 @@ const replaceAll = (
 
     const marks = Array.from(marksSet);
     
-    // Delete and insert with preserved marks
+    // Delete the old text
     tr.delete(from, to);
+
+    // Only insert new text if replaceTerm is not empty (allows for deletion when replaceTerm is empty)
+    if (replaceTerm) {
       tr.insert(from, tr.doc.type.schema.text(replaceTerm, marks));
     }
+  }
 
   dispatch(tr);
 };