Submitting a form with no event results in a runtime error (React Native)

Are you submitting a bug report or a feature request?

Feature request

What is the current behavior?

Submitting a form with no event results in a runtime error.

What is the expected behavior?

I’m using React Final Form on React Native and I don’t always have an event passed to the submit handler.

          <Form
                onSubmit={this.onSubmit}
                initialValues={/* ... */}
                render={({handleSubmit, reset, submitting, pristine, values}) => (
                    <View style={styles.container}>
                        <NavigationBar
                            leftButton="back"
                            onLeftButtonPress={this.props.navigator.pop}
                            rightButtonText={t("Save")}
                            onRightButtonPress={handleSubmit}
                        />
                ...
          </Form>

Sandbox Link

Obviously bad example just to show the error: https://codesandbox.io/s/k10xq99zmr

What’s your environment?

React Native 0.48 Final Form 3.0.0 React Final Form 2.1.0

Other information

It’s easy to bypass this error with this:

onRightButtonPress={() => {
    handleSubmit({preventDefault: () => {}});
}}

But I would rather have a check in the handleSubmit function to bypass the preventDefault call if no event is passed.

[erikras]

I’m happy to submit a PR

[lock[bot]]

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