fix: check if timestamp exists (#4639)

Author: helenosheaa

src/writeData/subscriptions/components/JsonParsingForm.tsx

@@ -77,7 +77,7 @@ const JsonParsingForm: FC<Props> = ({formContent, updateForm, edit}) => {
           placeholder="eg. $.myJSON.myObject[0].timestampKey"
           name="timestamp"
           autoFocus={true}
-          value={formContent.jsonTimestamp.path}
+          value={formContent.jsonTimestamp?.path}
           onChange={e => {
             updateForm({
               ...formContent,

src/writeData/subscriptions/utils/form.ts

@@ -122,6 +122,12 @@ export const sanitizeUpdateForm = (form: Subscription): Subscription => {
     if (newVal) {
       form.jsonTimestamp.path = newVal
     }
+    if (!form.jsonTimestamp?.name) {
+      form.jsonTimestamp.name = 'timestamp'
+    }
+    if (!form.jsonTimestamp?.type) {
+      form.jsonTimestamp.type = 'string'
+    }
   }
   delete form.id
   delete form.orgID