[Tracker] Tagging of notindexed files.

[Alexey Fisher <bug-track fisher-privat net>]

hallo all,

with latest version (0.7.21), if you tag not indexed file tag will be
silently lost.

Tracker do not do recursive indexing of all files (it is ok, it should
be). But if you try to tag file which was not indexed i think it should
be added to db and tagged.
 
to reproduce:
tracker-tag -a test ~/library/books/fresh/some.djvu 
Tag was added successfully

tracker-info ~/library/books/fresh/some.djvu 
Querying information for entity:'/home/lex/library/books/fresh/some.djvu'
Results: 0

tracker-tag -st test
Tag: 1 (shown by name)
  test
    urn:uuid:eea72e1b-34f5-9d6e-a844-b9d823ad0fbd
    0 files


Regards,
Alexey