S57: make GetExtent() return failure on DSID layer

git-svn-id: https://svn.osgeo.org/gdal/trunk@26991 f0d54148-0727-0410-94bb-9a71ac55c965
test_ogrsf: test invalid geometry field indices in SetSpatialFilter() and GetExtent()

git-svn-id: https://svn.osgeo.org/gdal/trunk@26992 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_mingw