mediaplayer: show __evUpdatedInfo debug when data exists

Signed-off-by: Erik Slagter <erik@openpli.org>
servicemp3: check if taglist has datetime when date is not available

Also fix a memory leak of GDate and remove g_date_strftime by getting
year using g_date_get_year

Signed-off-by: Erik Slagter <erik@openpli.org>
Merge remote-tracking branch 'openpli/master'