fix(laravel): eloquent accessors

[soyuka]

Q	A
Branch?	4.0
Tickets	Closes #6644
License	MIT

Fixes #6644 @toitzi may you review?

[toitzi]

@soyuka yes, it does fix the issue, however i think instead of this, fixing the underlaying Metadata class (see this pr) might be the better approach here. (Maybe merge those 2 Pr's - his code changes and your unittests)

[soyuka]

#6633 is definitely good but we should merge both as we can't know what's in this array for sure I think its best to define defaults values as it triggers a Fatal Error (500) and I'd like to avoid this anyways.