Merge pull request #1788 from jouvin/systemd_undefined_unit

ncm-systemd: ensure unit property is defined

Author: jrha

ncm-systemd/src/main/pan/components/systemd/schema.pan

@@ -17,7 +17,7 @@ type hwloc_location = string with match(SELF, '^[\w:.]+$');
     syslog facility to use when logging to syslog
 }
 type syslog_facility = string with match(SELF,
-    '^(kern|user|mail|daemon|auth|syslog|lprnews|uucp|cron|authpriv|ftp|local[0-7])$'
+    '^(kern|user|mail|daemon|auth|syslog|lpr|news|uucp|cron|authpriv|ftp|local[0-7])$'
 );
 
 @documentation{
@@ -545,11 +545,13 @@ type ${project.artifactId}_component = {
     # escaped full unitnames are allowed (or use shortnames and type)
     "unit" ? ${project.artifactId}_unit_type{}
 } with {
-    foreach(name; unit; SELF["unit"]) {
-        if (unit["type"] == "mount" && exists(unit["file"]) && exists(unit["file"]["config"]["mount"])) {
-            goodname = systemd_make_mountunit(unit["file"]["config"]["mount"]["Where"]);
-            if(goodname != name) {
-                error('Incorrect name for mount unit, the name must match Where: %s vs %s', name, goodname);
+    if (is_defined(SELF["unit"])) {
+        foreach(name; unit; SELF["unit"]) {
+            if (unit["type"] == "mount" && exists(unit["file"]) && exists(unit["file"]["config"]["mount"])) {
+                goodname = systemd_make_mountunit(unit["file"]["config"]["mount"]["Where"]);
+                if(goodname != name) {
+                    error('Incorrect name for mount unit, the name must match Where: %s vs %s', name, goodname);
+                };
             };
         };
     };