SELECT VALUE raises unexpected error

**Describe the bug**
The following queries work as expected:
```
SELECT VALUE (true)
SELECT VALUE (1)
SELECT VALUE ("foo")
```

But the following queries return an error "Cannot set property 'headers' of undefined":
```
SELECT VALUE (false)
SELECT VALUE (0)
SELECT VALUE ("")
SELECT VALUE (null)
```

**To Reproduce**
Run the queries in the Data Explorer.

**Expected behavior**
The correct values being returned without error.

**Actual behavior**
The above error is raised.

Start in the Data Explorer by running the listed SELECT VALUE queries and compare the handling of truthy and falsy results. Trace the result path that raises "Cannot set property 'headers' of undefined"; done means false, 0, empty-string, and null values return correctly without the error.

Written by the indexing model from the issue text.