fix for bug 2867833: wait database initialization in xcatd

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@4242 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Table.pm

@@ -587,6 +587,10 @@ sub new
                 $self->{dbh}->do($str);
             }
         } else { #generic DBI
+           if (!$self->{dbh})
+           {
+               return undef;
+           }
            my $tbexistq = $self->{dbh}->table_info('','',$self->{tabname},'TABLE');
         my $found = 0;
            while (my $data = $tbexistq->fetchrow_hashref) {