The new validation API does not like system generated identifiers

[jeromesimeon]

Description

In Concerto 1.0.0-alpha.2 It isn't possible to validate against models with system-generated identifiers.

Example

Model

namespace org.test

concept C identified {
}

Data

{ "$class": "org.test.C" }

Results in the following exception:

Instance org.test.C#undefined has an empty identifier.

[jeromesimeon]

Addressed in #246:

zsh-5.8$ more test.cto
namespace org.test

concept C identified {
}
zsh-5.8$ more test.json
{ "$class": "org.test.C" }
zsh-5.8$ ./index.js validate --model test.cto --input test.json --functional
2:14:44 PM - INFO: Input is valid