Fix a bug.
Created originally on Bitbucket by HuangYi_NJU (Yi Huang)
Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.
Fix a bug. when a xlsm file containing comments is saved, it may occar. Files like commentsDrawing1.vml was used to save comments information. In the previous code, the files like commentsDrawing1.vml will be writed twice in line 81 and line 144. If a xlsm file containing comments is editd by openpyxl twice, it will be demaged.