Viewing data of a zero-column table gives an assertion failure

[Heikki Linnakangas <heikki(at)enterprisedb(dot)com>]

Viewing data of a table with zero columns triggers this assertion:

./db/pgSet.cpp(222): assert "col < nCols && col >= 0" failed in
GetVal(). [in child thread]

To reproduce, create a table with no columns, and click "View Data" ->
"First 100 rows".

This is with an up-to-date SVN checkout.

-- 
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com