[stempler] Fatal error when including php partials that do not end with "?>"

[SerafimArts]

Description

In the case that a file was included that does not end with the ?> character, then a fatal error occurs in the resulting template.

Left column: partial file
Right column: generated code

How To Reproduce

1. Create partial, like:

<!-- example.dark.php -->
<?php
echo 'Hello, I`m a partial';

2. Create template file and include this partial:

<use:element path="xxxxx/example" as="some" />

3. Render template file

Additional Info

Q	A
Framework Version	2.6
PHP version	7.2+
Operating system	Any