Emit compiler warning, if riot script tag is outside of root tag

[mojo2012]

Help us to manage our issues by answering the following:

1. Describe your issue:
   I was wondering for half an hour why this didn't work:

<header class="mdl-layout__header">
    <div class="mdl-layout__header-row">
        <!-- Title -->
        <span class="mdl-layout-title">{props.title}</span>

        <slot name="items-left"></slot>

        <!-- Add spacer, to align navigation to the right -->
        <div class="mdl-layout-spacer"></div>

        <slot name="items-right"></slot>
    </div>
</header>

    <script lang="ts">
        import { UINavbar } from "./UINavbar.ts";
        export default new UINavbar();
    </script>

There was no warning or error message. It did even render on screen, just the script tag was ignored.

2. Can you reproduce the issue?
   Yes always

3. How would you tag this issue?

• Question
• Bug
• Discussion
• Feature request
• Tip
• Enhancement
• Performance

[GianlucaGuarini]

@mojo2012 that's a good Idea thank you for your feedback