Fix system tests

Author: oliwenmandiamond

tests/system_tests/plans.json

@@ -20,7 +20,8 @@
                     },
                     "num": {
                         "title": "Num",
-                        "type": "integer"
+                        "type": "integer",
+                        "default": 1
                     },
                     "delay": {
                         "anyOf": [
@@ -34,12 +35,14 @@
                                 "type": "array"
                             }
                         ],
+                        "default": 0.0,
                         "title": "Delay"
                     },
                     "metadata": {
                         "additionalProperties": true,
                         "title": "Metadata",
-                        "type": "object"
+                        "type": "object",
+                        "default": "None"
                     }
                 },
                 "required": [