defect 3373326: display a message and continue if no repository was created in the kerneldir

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@10191 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/share/xcat/netboot/rh/genimage

@@ -183,7 +183,6 @@ unless ($onlyinitrd) {
       find(\&isyumdir, <$kerneldir/>);
       if (!grep /$kerneldir/, @yumdirs) {
          print "The repository for $kerneldir should be created before running the geniamge. Try to run [createrepo $kerneldir].\n";
-         exit 1;
       }
    }
    unless (scalar(@yumdirs)) {