If you look at the module information from CPAN.pm, you got the following:

Module id = DBD::Google
    DESCRIPTION  Treat Google as a DBI datasource
    CPAN_USERID  DARREN (Darren Chamberlain <darren@cpan.org>)
    CPAN_VERSION undef
    CPAN_FILE    Contact Author Darren Chamberlain <darren@cpan.org>
    DSLI_STATUS  bdpO (beta,developer,perl,object-oriented)
    INST_FILE    (not installed)

Normally CPAN_FILE should be a relative path to the file distribution on CPAN. It seems that something got wrong while indexing the distribution. It's best to contact the author about the fact --- maybe he has just to make a new release to fix the problem.