File common-Check-for-non-empty-string-before-chomp.patch of Package warewulf

From: Egbert Eich <eich@suse.com>
Date: Mon Oct 4 19:56:06 2021 +0200
Subject: common: Check for non-empty string before chomp()
Patch-mainline: Not yet
Git-commit: 095b0b5452183654517c30e231912af82baf0c9d
References: 

Signed-off-by: Egbert Eich <eich@suse.com>
---
 common/lib/Warewulf/System/Suse.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/common/lib/Warewulf/System/Suse.pm b/common/lib/Warewulf/System/Suse.pm
index 155547c..78e4075 100644
--- a/common/lib/Warewulf/System/Suse.pm
+++ b/common/lib/Warewulf/System/Suse.pm
@@ -80,7 +80,9 @@ service($$$)
         while(<SERVICE>) {
             $self->{"OUTPUT"} .= $_;
         }
-        chomp($self->{"OUTPUT"});
+	if (defined($self->{"OUTPUT"})) {
+	    chomp($self->{"OUTPUT"});
+	}
         if (close SERVICE) {
             &dprint("Service command ran successfully\n");
             return(1);