FileGDB/OpenFileGDB: avoid error message when failing to import SRS from WKID code (might be an ESRI code for example)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27521 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx