This is intended to handle possibly unallocated columns similarly
to CreateColumnIfNotExists(), but unlike that one this one does not
allocate, if the column is not allocated then the default column
data is returned. This is intended for reading of columns.
Change-Id: Ic3b637eb3d16bac69ebc7ecd389973407db4f7fd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140737
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>