Please use the forum for support. Http://forum.Joomla.org

It's a bug. https://www.joomla.org/?tmpl= does it too.

The code in the app classes rendering the document needs an additional sanity check against an empty tmpl query parameter.

It's not strictly an empty one. It's just an invalid one. Try "test" or "foo" or anything where there is no template file for it. If the file is missing, it will create that blank page.
It's not really an error as no error or warning is shown (not like blank pages usually would indicate).

So the options would be to show a Joomla error page "file not found" or just silently fall back to the regular index.php file.
Not sure what makes more sense.

https://docs.joomla.org/Priority

Hardly a Priority 2 issue

On 2 May 2016 at 22:18, Thomas Hunziker notifications@github.com wrote:

It's not strictly an empty one. It's just an invalid one. Try "test" or
"foo" or anything where there is no template file for it. If the file is
missing, it will create that blank page.
It's not really an error as no error or warning is shown (not like blank
pages usually would indicate).

So the options would be to show a Joomla error page "file not found" or
just silently fall back to the regular index.php file.
Not sure what makes more sense.

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#10207 (comment)

Brian Teeman
Co-founder Joomla! and OpenSourceMatters Inc.
http://brian.teeman.net/

So the options would be to show a Joomla error page "file not found" or just silently fall back to the regular index.php file.

JDocumentHtml already falls back on the system template if it can't find the file, so that part's somewhat OK (but it doesn't account for if the file doesn't exist in the system template too). Another part of the issue is JDocumentHtml::render() shouldn't be getting called to begin with while the file data is empty (start at https://github.com/joomla/joomla-cms/blob/staging/libraries/cms/application/site.php#L706 and trace it forward). JApplicationCms should be ensuring it defaults to index.php no matter what.

I went and added a fallback in JDocumentHtml where the current fallback to the system template already exists. I think it makes most sense there.
See #10210

Closing as we have a PR.