Fix for search by _id

[nemanjan00]

No description provided.

[alwint3r]

I think this is not a clean way to handle convert the search value for _id that has ObjectID type.

Alternatively, you can add a check whether the value complies with ObjectID format, then you can convert the string to ObjectID object and then return it from function parseSearchValue at lib/column.js file.

[nemanjan00]

What if value is in ObjectID format, but, is not ObjectID, but string?