1.5.0.24

Check for null before continuing

1.5.0.23

Add an id lookup, add better logging [...]

Add an id lookup, add better logging for the image provider, and
fix the locking mechanism and add logic to remove
dummy seasons and duplicate seasons.

1.5.0.22

Make missing metadata and extras mandatory

1.5.0.21

Remove extra videos on delete

1.5.0.20

Provide moew detailed season data for default grouping

1.5.0.19

Add trailers, theme videos genres and tweak the events used

1.5.0.18

Rename missing metadata provider

to extra metadata provider, since it can provide extra metadata such
as trailers, theme videos and missing episodes.

1.5.0.17

Add support for dual-level libraries

1.5.0.16

Hopefully fix the metadata provider this time

1.5.0.15

Don't add a special season if one already exists