v4.5.1

GraphPPL v4.5.1

Diff since v4.5.0

Merged pull requests:

• Fix walk into created by guard to not fail on empty expressions (#263) (@wouterwln)
• Fix issue 262 (#264) (@bvdmitri)

Closed issues:

• It is not possible to instantiate an empty array in the model macro (#261)
• Factorization constraints may attempt to create a variable (#262)