Always make sure the driver is available
Update return when no data for table view

Instead of return a blank when there is no data use the default return of 'None'.
This allows Symphony to display links if the field is set as the first entry and
thus in table view would have to be linked. When this was none no link was displayed
thus making the entry unreachable.
Merge pull request #16 from jonmifsud/patch-1

Return 'None' instead of nothing so that Symphony can correctly link to Textbox fields with no data from the backend.