Subprocess error handling: Fix when divert check fails

If the remote command failed, do not try to match the undef value
against the various regexps.

1 files changed, 2 insertions, 2 deletions

diff --git a/dgit b/dgit
index f60180c..54a1c15 100755
--- a/dgit
+++ b/dgit
@@ -1160,7 +1160,7 @@ sub check_for_git () {
 	     " set -e; cd ".access_cfg('git-path').";".
 	     " if test -d $package.git; then echo 1; else echo 0; fi");
 	my $r= cmdoutput @cmd;
-	if ($r =~ m/^divert (\w+)$/) {
+	if (defined $r and $r =~ m/^divert (\w+)$/) {
 	    my $divert=$1;
 	    my ($usedistro,) = access_distros();
 	    # NB that if we are pushing, $usedistro will be $distro/push
@@ -1169,7 +1169,7 @@ sub check_for_git () {
 	    progress "diverting to $divert (using config for $instead_distro)";
 	    return check_for_git();
 	}
-	failedcmd @cmd unless $r =~ m/^[01]$/;
+	failedcmd @cmd unless defined $r and $r =~ m/^[01]$/;
 	return $r+0;
     } elsif ($how eq 'url') {
 	my $prefix = access_cfg('git-check-url','git-url');