wgd ls swallows errors

[patspam]

wgd ls wraps $wgd->asset->find($parent) in an eval and then reports "asset not found" regardless of the type of exception. This swallows errors such as invalid json in the site.conf

[haarg]

I've fixed one part of this, so now WGDev will refuse to use invalid config files. The handling of errors in the ls command still needs to be improved though.