Map empty priority for PCF project (#1210)

Author: davehunt

config/config.prod.yaml

@@ -387,6 +387,7 @@
     status_map: *basic-status-map
     resolution_map: *basic-resolution-map
     priority_map:
+      "": (none)
       P1: P1
       P2: P2
       P3: P3