-Fix crash when a plugin provides callback data with something other than a list reference when called from another plugin

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@9013 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/sbin/xcatd

@@ -1428,7 +1428,11 @@ sub build_response {
   my $resp = shift;
   foreach (keys %$resp) {
     my $subresp = dclone($resp->{$_});
-    push (@{$Main::resps->{$_}}, @{$subresp});
+    if (ref $subresp eq 'ARRAY') {
+        push (@{$Main::resps->{$_}}, @{$subresp});
+    } else {
+        push (@{$Main::resps->{$_}}, $subresp);
+    }
   }
 }