adhoc-revtuple-generator: Avoid an undefined variable warning

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

diff --git a/adhoc-revtuple-generator b/adhoc-revtuple-generator
index 4a2ec63ae8c5d094648060ad1d2da22bd9682f44..dbe4773ad485cd4f40fdabb966bbd43942122b78 100755 (executable)
--- a/adhoc-revtuple-generator
+++ b/adhoc-revtuple-generator
@@ -129,6 +129,7 @@ END
            m/^(\w+)\s(.*)$/ or die "$cmd: $_ ?";
            push @{ $r{$1} }, $2;
        }
+       $r{Parents} ||= [ ];
        die "$treename -" unless @{ $r{commit} } == 1;
        die "$treename -" unless @{ $r{committer} } == 1;
        die "$treename -" unless $r{committer}[0] =~ m/ (\d+)(?: [-+]\d{4})$/;