Issues with creating/modifying articles that no longer have a matching template.

[Arjen-Smit]

Q	A
Bug?	no
New Feature?	yes
SuluArticleBundle Version	0.6.2
Sulu Version	1.6

Actual Behavior

when renaming the key of a template but not the name of the file itself it's still possible to open a article in the admin. but it has multipage enabled and you won't be able to save the article. Also it's possible to create a new article based on that template (although the page won't load)

Expected Behavior

Should give a clear warning that the template can not be found. and avoid opening the page in that case, to avoid issues with the content.

Steps to Reproduce

Rename the <key> in an article template without changing the filename.

Possible Solutions

There should be a template checker cause this could cause weird issues. To my knowledge something similar already exists in the pages section.