scripting: Pass a proper array equal to collection size.

Change-Id: I2c4c85b2da7b7037fc9da16793d18667b3d25503
Reviewed-on: https://gerrit.libreoffice.org/11375
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>