Possible bug in subtree matching with empty title + tags

[Christian Heinrich]

Hi,

I'm often using empty header titles that only contain tags, such as

> **    :foo:

In my case, this is sufficient (for instance for flashcards, where I never have 
to actually have to
use the agenda etc.). However, since Nicolas's refactoring in
be31a0c4595a6d68b03b5cfbcbcdbf2cd76d2b7f empty titles seem to be prohibited. In 
the above example,
using subtrees (C-/ m) on the "foo" tag will return nothing, even though the 
tag is in the file. Is
this a deliberate change? I didn't see a note in the manual saying that 
headings must not be empty
(this might be useful then).

Thanks for your help guys!

Cheers
Christian

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