chore: fix formData should be undefined

Signed-off-by: blam <ben@blam.sh>

plugins/scaffolder-react/src/extensions/rjsf.ts

@@ -64,7 +64,7 @@ export interface ScaffolderRJSFFieldProps<
   /** The tree of unique ids for every child field */
   idSchema: IdSchema<T>;
   /** The data for this field */
-  formData: T;
+  formData?: T;
   /** The tree of errors for this field and its children */
   errorSchema?: ErrorSchema<T>;
   /** The field change event handler; called with the updated form data and an optional `ErrorSchema` */

plugins/scaffolder/src/components/fields/MultiEntityPicker/MultiEntityPicker.tsx

@@ -115,7 +115,7 @@ export const MultiEntityPicker = (props: MultiEntityPickerProps) => {
             }
 
             // We need to check against formData here as that's the previous value for this field.
-            if (formData.includes(ref) || allowArbitraryValues) {
+            if (formData?.includes(ref) || allowArbitraryValues) {
               return entityRef;
             }
           }
@@ -173,7 +173,7 @@ export const MultiEntityPicker = (props: MultiEntityPickerProps) => {
             required={required}
             InputProps={{
               ...params.InputProps,
-              required: formData.length === 0 && required,
+              required: formData?.length === 0 && required,
             }}
           />
         )}