Refactor null tests for remaining residence checks

Author: prestoncabe

library-api/test/bdt/checks/residence/LivesInPhiladelphiaPa/Null.bru

@@ -13,7 +13,9 @@ post {
 body:json {
   {
     "situation": {
-      "simpleChecks": null
+      "simpleChecks": {
+        "livesInPhiladelphiaPa": null
+      }
     }
   }
 }

library-api/test/bdt/checks/residence/OwnerOccupant/Null.bru

@@ -0,0 +1,26 @@
+meta {
+  name: Null
+  type: http
+  seq: 3
+}
+
+post {
+  url: {{host}}/checks/residence/owner-occupant
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "situation": {
+      "simpleChecks": {
+        "ownerOccupant": null
+      }
+    }
+  }
+}
+
+assert {
+  res.body.checkResult: eq null
+  res.status: eq 200
+}