feat: Inform user if no file was written

When the user exits the note-writing editor process without having
written any file, we also don't attach an annotation to the
corresponding task since it would lead nowhere.

This small change makes this condition obvious to the user, by informing
them that the program is 'doing nothing' when they exit the editor
without having saved a file.

topen.py

@@ -69,6 +69,8 @@ def main():
 
     if fpath.exists():
         add_annotation_if_missing(task, annotation_content=cfg.notes_annot)
+        return
+    whisper("No note file, doing nothing.")
 
 
 def get_task(id: str | int, data_location: Path) -> Task:
@@ -92,7 +94,7 @@ def get_notes_file(uuid: str, notes_dir: Path, notes_ext: str) -> Path:
 
 def open_editor(file: Path, editor: str) -> None:
     """Opens a file with the chosen editor."""
-    _ = whisper(f"Editing note: {file}")
+    whisper(f"Editing note: {file}")
     _ = subprocess.run(f"{editor} {file}", shell=True)