from Writer with Chinese UI. When user configure UI language as
Chinese, style names are also translated. However when Copy-pasting
from Writer to Impress ( select RTF fromat with paste-special),
Chinese (unicode) style names are borken into multiparts, where
some of them are empty string. Neither deleting the abnormal
style nor saving the file can be achieved. The only remedy is to
remove style with emtpy name with macro. With this patch:
1) Catch NoSuchElementException and ignores it, so
   user still has chance saving file.
2) Make sure style has valid number before inserting it.
3) Prevent text breaking into multiple tokens by handling  ucN in
 ScanText().

Change-Id: I417f70b81c23ac63c175cc13c548068873d13a38
Reviewed-on: https://gerrit.libreoffice.org/18148Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/19685
(cherry picked from commit 52f3eb47)