Feed is titled "all articles" if only one list of articles is found

[sup]

If the output of parse_index is

('feed title1',[list of articles1]),

the resulting structure of the ebook created is

Title of the recipe
----All Articles
---------First article from the list
---------Second article from the list
---------etc

If the output is

('feed title1',[list of articles1]),('feed title2',[list of articles2]),

the resulting structure is:
Title of the recipe
----feed title1
---------First article from the list
---------Second article from the list
---------etc
----feed title2
---------First article from the list
---------Second article from the list
---------etc

(the difference is that in the first case, 'feed title1' is not used and instead generic 'all articles' is used).

Is this intentional? If so, why? In my recipe, the feed title changes, so I would like to have it.