- only ask for a password, when postgis needs one (fixes #1400)
- don't complain about 'no accessible geometry tables', before checking for
  tables not listed in geometry_columns (fixes #1455)


git-svn-id: http://svn.osgeo.org/qgis/trunk@9778 c8812cc2-4d05-0410-92ff-de0c093fc19c