MobTalker2.pack error tolerance

[Fabian Maurer]

Using MobTalker 0.3.7.

Make a few mroe checks to handle illformed MobTalker2.pack files.

The following code:

#!

"Files": [
    "Story/Main.script",
],

tries to load two script files, the first is "Story/Main.script", the second is null.

[Chimaine]

Check for null elements in JSON arrays to prevent NPE's from malformed lists in script pack configs. Fixes #48

→ <<cset b3c1c3a86bcb>>