Mutable cells in classic notebooks with initial value of null cause error #21
Closed as not planned
Description
If a classic notebook contains a Mutable
mutable foo = nullthen importing the cell into a notebook via
import {foo} from "observable:…"and displaying it via
foofails with the error
RuntimeError: null is not an object (evaluating '_.generator')
Minimal repro
<!doctype html>
<notebook>
<script type="module">
import {foo} from "observable:d/3a120539ecaa0449@70"
</script>
<script type="module">
foo
</script>
</notebook>