ParseSource.Set(): allow setting stanza if in lyricmode

Author: eoma

ly/musicxml/lymus2musxml.py

@@ -477,6 +477,9 @@ def Set(self, cont_set):
             self.mediator.set_by_property(cont_set.property(), val)
         elif cont_set.context() in group_contexts:
             self.mediator.set_by_property(cont_set.property(), val, group=True)
+        elif cont_set.property() == 'stanza' and self.alt_mode == 'lyric':
+            self.mediator.set_by_property(cont_set.property(), val)
+
 
     def Command(self, command):
         r""" \bar, \rest etc """