show_abs_time: Represent undef $timet as <undef>

This can happen, for example, if a badly broken flight has steps which
are STARTING and have NULL in the start time column, and is then
reported using sg-report-flight.

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

diff --git a/Osstest.pm b/Osstest.pm
index b2b6b74178c4c9d811b9589441599d7826f0c559..734c0ef6bf91d98685c514228ca8d034c5df29b8 100644 (file)
--- a/Osstest.pm
+++ b/Osstest.pm
@@ -457,6 +457,7 @@ sub visible_undef ($) {
 
 sub show_abs_time ($) {
     my ($timet) = @_;
+    return '<undef>' unless defined $timet;
     return strftime "%Y-%m-%d %H:%M:%S Z", gmtime $timet;
 }