This is to reflect the JDBC specification where invalid column names
result in an SQLException.

(The drivers within LibreOffice are being updated to reflect this new
specification.)

Change-Id: I76cdf9d5d15d55b534b28219b541ff9190365f9d
Reviewed-on: https://gerrit.libreoffice.org/5921Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>