value="null" when using angular universal

[kamilchlebek]

Describe the bug
Assume you've created page with ng-select component that has some set of items but currently does not have any value. When you render page using angular universal, <div class="ng-input"><input role="combobox" type="text" autocomplete="a0eb5d2d24b2" value="null" aria-expanded="false"></div> is being added to HTML which causes NULL text to be visible inside the input. After client app loads NULL disappears. It appears no matter if I'm using template or reactive forms.

To Reproduce

1. Configure angular universal
2. Add simple ng-select component to page
3. Build & run ssr
4. See error (before client app loads)

Expected behavior
ng-select should not render value="null" as it disappears later

Desktop (please complete the following information):

• OS: Ubuntu 16.04
• Browser: Chrome
• Version: 67.0.3396.99

I've created simple repo with universal and ng-select configured.
https://github.com/kamilchlebek/universal-ng-select

To see this error run:

1. npm install
2. npm build
3. npm start:server
4. open localhost:4000

[anjmao]

Hi @kamilchlebek,

Thanks for repo, PR is welcome for angular universal, that would be great to support it 👍