Parser function {{#int:}} returns the message name surrounded with < and > when the message is not found.

Using {{int:Cite}} will result in a valid tag (<cite>) which is accept by the wiki parser and outputted with the html and gives a bad result, due to html tidy it will be closed at the end of the page.

MediaWiki should escape the return value of {{#int:}} when the message is non-existant to avoid this tags.
Should get parser tests.