Custom emojis lead to an error with Confluence 8.4.0

During the testing for compatibility with Confluence 8.4.0 we encountered a bug where displaying the new custom emoji feature from Confluence is not possible. As soon as a custom emoji is added, the Viewport throws an error once you navigate to the page that contains the emoji.

Steps to reproduce:

1. Create a custom emoji.

2. Use it on a page

3. Click on the icon to display the Viewport for that page

4. There is an error message:

Error in Help Center Theme

Failed to render template '/page.vm'.
Invocation of method 'getContent' in class com.k15t.scroll.viewport.api.placeholder.ScrollPagePlaceholder threw exception java.lang.NullPointerException at /templates/macros/pageContent.vm[line 11, column 16]

Error in WebHelp Theme

    Failed to render template '/page.vm'.
    Invocation of method 'template' in class com.k15t.scroll.viewport.api.placeholder.IncludePlaceholder threw exception com.k15t.scroll.runtime.confluence.content.transform.render.RenderingException: Failed to render template '/include/include-content.vm'. at /page.vm[line 25, column 14]
    Failed to render template '/include/include-content.vm'.
    Invocation of method 'getContent' in class com.k15t.scroll.viewport.api.placeholder.ScrollPagePlaceholder threw exception java.lang.NullPointerException at /include/include-content.vm[line 16, column 19]

Expected result:
The custom emoji is shown on the Viewport.

Actual result:
The custom emoji causes a system error.

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