OS-15679: Fix cells mapping project property

Domingo Rivera Barrosrequested to merge
driverab_fix_create into master

To avoid bug described in https://its.cern.ch/jira/browse/OS-15679 where cells_mapping was stored as follows:

+------------+--------------------------------------+
| properties | {'cells_mapping': 'gva_project_053'} |
+------------+--------------------------------------+

Instead of:

+---------------+-----------------+
| cells_mapping | gva_project_053 |
+---------------+-----------------+
Edited by Domingo Rivera Barros

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