I'm getting an error if I attempt to Revert Selection on a line if the first line in the tracked file has been deleted. If I manually restore the first line, the revert works as expected.

• VSCode Version:
  1.15.1
  1.16.0-insider

• OS Version:
  Windows 10 x64

• git version
  2.13.3.windows.1 ( also upgraded to 2.14.1.windows.1)

Steps to Reproduce:

1. Delete the first line in a file tracked by Git
2. Modify any line after what is the new line 1, e.g. line 4
3. Revert Selection on the modified (line 4)
4. A prompt appears that states Git: Illegal value for line : Open Git Log, Close
5. If you clear the git log just prior to the attempt, it's still empty after

Reproduces without extensions: Yes