Empty or Comment Only File Dies with Unexpected Error

Preflight Checklist

• I have installed the latest version of Power Query SDK.
• I have checked existing resources, including the common issues and the release notes.
• I have searched for similar issues.

Power Query SDK

0.3.1

Regression From

No response

Platform

All

Architecture

x64

OS Version

No response

VSCode version

No response

PQSdkTool Path

No response

Bug Description

If a query test file is evaluated that is either blank or only contains a comment, an unexpected error is output.

The error indicates that a "token literal" is expected (even though non-literal values are also allowed) and indicates that the error occurs on line 3, even though the file does not contain 3 lines.

Steps to Reproduce

1. Create a new PQ SDK project.
2. Either empty the '.query.pq' file, or set it to contain only a single-line comment (e.g. //hi).
3. Evaluate the .query.pq file.

Actual Experience

The following error is returned:

Token Literal expected. Start position: (3, 1). End position (3, 2).

Expected Experience

At minimum, correct line numbering (e.g. reporting the error as occurring on line 1, not the non-existent line 3).

Ideally, a message saying effectively that some code is expected in the file (maybe that the file must contain either an expression or a section document).

Additional Context

Related: https://github.com/microsoft/vscode-powerquery-sdk/issues/244