Doesn't play well with page-inject plugin

[HunterDG]

Unexpected behavior when attempting to inject a file_browser_plugin.md page into another page via [plugin:page-inject](/route/to/page)

I've played around a bit unsuccessfully. Sorry for lack of details. It's quite easy to duplicate.

[N-Parsons]

There's a check in the code to ensure that the folder structure only gets evaluated on pages that have the file_browser_plugin template, so this is probably the cause. The check exists to avoid wasting effort on other pages where the twig variable won't be used, and I'm not familiar enough with the Page Inject plugin to know whether there's an easy way to detect this.

For now, if you want to get around this, you can either remove or update the following line: https://github.com/N-Parsons/grav-plugin-file-browser/blob/master/file-browser.php#L43