v5.3.1 knobs: runtime exception on null value in select array

[johnhunter]

Describe the bug
Updating addon-knobs to 5.3.1 throws a TypeError when a select knob array argument contains a null.

To Reproduce
Steps to reproduce the behavior:

1. Create a story as per the snippet below
2. npm run storybook
3. Navigate to the "null" story
4. See exception thrown in console Uncaught TypeError: Cannot read property 'label' of null

Expected behavior
Story should display with the following select options for 'value':
1, 2, 3, _undefined_, null

Code snippets

stories.add(
  'null',
  () => {
    const value = select('value', [1, 2, 3, undefined, null], 1);
    return <div>{value}</div>;
  }
);

System:

  System:
    OS: macOS 10.15.2
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
  Binaries:
    Node: 12.12.0 - /usr/local/bin/node
    Yarn: 1.19.1 - /usr/local/bin/yarn
    npm: 6.13.1 - /usr/local/bin/npm
  Browsers:
    Chrome: 79.0.3945.117
    Firefox: 72.0.1
    Safari: 13.0.4
  npmPackages:
    @storybook/addon-actions: ^5.3.1 => 5.3.1 
    @storybook/addon-backgrounds: ^5.3.1 => 5.3.1 
    @storybook/addon-console: ^1.2.1 => 1.2.1 
    @storybook/addon-info: ^5.3.1 => 5.3.1 
    @storybook/addon-knobs: ^5.3.1 => 5.3.1 
    @storybook/addon-links: ^5.3.1 => 5.3.1 
    @storybook/addon-notes: ^5.3.1 => 5.3.1 
    @storybook/addon-options: ^5.3.1 => 5.3.1 
    @storybook/addon-viewport: ^5.3.1 => 5.3.1 
    @storybook/addons: ^5.3.1 => 5.3.1 
    @storybook/cli: ^5.3.1 => 5.3.1 
    @storybook/react: ^5.3.1 => 5.3.1 

[johnhunter]

Thanks guys!

[shilman]

Ta-da!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.3.3 containing PR #9416 that references this issue. Upgrade today to try it out!

[johnhunter]

Less than 24h turnaround - fantastic!! 🙌