Improve exception handling

histd.py

@@ -37,7 +37,13 @@ def edit_note(base_dir: str, note_date: date):
     filename = f'{note_date.day:02}.txt'
     path_to_file = os.path.join(workdir, filename)
     editor = os.environ.get('EDITOR', 'nano')
+    try:
         subprocess.run([editor, path_to_file], check=True, cwd=base_dir)
+    except FileNotFoundError:
+        print("Error: I can't find your text editor")
+        print("Make sure the 'EDITOR' environment variable is set correctly")
+    except subprocess.CalledProcessError:
+        print("Your editor returned non-zero exit code")
 
 
 if __name__ == '__main__':