checker: fix orm unreachable code checking

[felipensp]

Fix #16330

sql dbs {
        insert repo into Target
    } or {
        println(err)
        return 1
    }
    assert true // checker was pointing as unreachable code
    return 1 

[enghitalo]

I was waiting for this, too!! Thanks, man!

[spytheman]

Good work.