allow multiple empty partitions

Author: sjpb

templates/slurm.conf.j2

@@ -129,9 +129,8 @@ NodeName={{ hostlist }} State=UNKNOWN RealMemory={{ group.get('ram_mb', ram_mb)
             {% set _ = nodelist.append(extra_node_defn['NodeName']) %}
         {% endfor %}
     {% endfor %}{# group #}
-{% if not nodelist %}  {# empty partition - define an invalid hostname which slurm accepts #}
-    {% set nodelist = ['n/a'] %}
-NodeName={{ nodelist[0] }}
+{% if not nodelist %}  {# empty partition #}
+    {% set nodelist = ['""'] %}
 {% endif %}
 PartitionName={{part.name}} Default={{ part.get('default', 'YES') }} MaxTime={{ part.get('maxtime', openhpc_job_maxtime) }} State=UP Nodes={{ nodelist | join(',') }} {{ part.partition_params | default({}) | dict2parameters }}
 {% endfor %}{# partitions #}