Script warnings for non-existant DropItems...

[Major Cooke]

...in DECORATE in particular, if doable. Because you can have items defined but they don't give off a warning in DECORATE if they don't exist, which can make tracking them down a bit of a pain since they give no indication whatsoever except for the fact they don't drop.

One small typo is all it needs, and it could fly under the radar for months, if not years for some mods...

[_mental_]

To be sure I didn't miss anything, here is the PR.

[Major Cooke]

Looks perfect.