fix: runtime errors on slideform

_uid and item were undefined and throwing errors on navigation past the last form to the next interface. this fix uses optional chaining to set id and intiialValues to undefined instead of throwing error

lib/interviewer/containers/SlidesForm/SlideFormNode.js

@@ -2,7 +2,10 @@ import React, { PureComponent } from 'react';
 import PropTypes from 'prop-types';
 import { withProps } from 'recompose';
 import Scroller from '~/lib/ui/components/Scroller';
-import { entityAttributesProperty, entityPrimaryKeyProperty } from '@codaco/shared-consts';
+import {
+  entityAttributesProperty,
+  entityPrimaryKeyProperty,
+} from '@codaco/shared-consts';
 import Node from '../../components/Node';
 import Form from '../Form';
 
@@ -11,15 +14,17 @@ class SlideFormNode extends PureComponent {
     const { id, item, onUpdate } = this.props;
     // TODO: is item (node) neccessary?
     onUpdate?.(id, item, formData);
-  }
+  };
 
   render() {
     const {
       form = {},
       item,
       initialValues,
       subject,
-      submitButton = <button type="submit" key="submit" aria-label="Submit" hidden />,
+      submitButton = (
+        <button type="submit" key="submit" aria-label="Submit" hidden />
+      ),
       id,
       otherNetworkEntities,
       onScroll,
@@ -60,8 +65,8 @@ SlideFormNode.propTypes = {
 };
 
 const withNodeProps = withProps(({ item }) => ({
-  id: item[entityPrimaryKeyProperty],
-  initialValues: item[entityAttributesProperty],
+  id: item?.[entityPrimaryKeyProperty],
+  initialValues: item?.[entityAttributesProperty],
 }));
 
 const EnhancedSlideFormNode = withNodeProps(SlideFormNode);