Bug Fix: FormBuilderFieldOption may not have a child -- the option is the widget.

Author: awhitford

lib/src/fields/form_builder_choice_chips.dart

@@ -309,7 +309,7 @@ class FormBuilderChoiceChip<T> extends FormBuilderField<T> {
                   children: <Widget>[
                     for (FormBuilderFieldOption<T> option in options)
                       ChoiceChip(
-                        label: option.child,
+                        label: option,
                         selected: field.value == option.value,
                         onSelected: state.readOnly
                             ? null

lib/src/fields/form_builder_filter_chips.dart

@@ -107,7 +107,7 @@ class FormBuilderFilterChip<T> extends FormBuilderField<List<T>> {
                 children: <Widget>[
                   for (FormBuilderFieldOption<T> option in options)
                     FilterChip(
-                      label: option.child,
+                      label: option,
                       selected: field.value.contains(option.value),
                       onSelected: (state.readOnly ||
                               (maxChips != null &&

lib/src/widgets/grouped_checkbox.dart

@@ -277,7 +277,7 @@ class _GroupedCheckboxState<T> extends State<GroupedCheckbox<T>> {
       tristate: widget.tristate,
       onChanged: isOptionDisabled
           ? null
-          : (bool selected) {
+          : (selected) {
               selected
                   ? selectedListItems.add(optionValue)
                   : selectedListItems.remove(optionValue);