Bug 13655: Same fix for partial edit

Bug 13655: Same fix for partial edit

Test plan:
- Create an organisation with surname='xxx'
userid will be autogenerated with 'xxx''
- Edit the surname with 'yyy'
userid will be unchanged, 'xxx'
- Parial edit and blank userid
userid will be autogenerated with 'yyy'

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>