Attempting To Load A Tileset With A Non 8 Multiple Size Returns A "No Error" Error

[bhelyer]

(Apologies for the issue spam, but I'm starting to try and adapt my game to use Tilengine, and I know these are the sorts of issues someone working on the project is likely to forget about/not encounter, but can really affect first impressions, so I figured I'd throw them up here as I see 'em)

The LoadTileset code isn't checking the return value of TLN_CreateTileset, and is wiping out the error message. Which, if it doesn't mention the dimension issue being the reason for the failure, it probably should.