use only chord labels for 'annotated_key' metadata column if they spe…

…cify a global key followed by . (a period)

src/ms3/bs4_parser.py

@@ -1192,7 +1192,7 @@ def _get_metadata(self):
         for harmony_tag in self.soup.find_all('Harmony'):
             label = harmony_tag.find('name')
             if label is not None and label.string is not None:
-                m = re.match(r"^\.?([A-Ga-g](#+|b+)?)", label.string)
+                m = re.match(r"^\.?([A-Ga-g](#+|b+)?)\.", label.string)
                 if m is not None:
                     annotated_key = m.group(1)
                     break