Blaming still open and deleted file crashes the extension

[dmitriismitnov]

• Issue Type: Bug
• Extension Name: gitblame
• Extension Version: 2.8.0
• OS Version: Darwin x64 18.6.0
• VSCode version: 1.36.0-insider

{
	"messages": [],
	"activationTimes": {
		"startup": true,
		"codeLoadingTime": 43,
		"activateCallTime": 1,
		"activateResolvedTime": 15,
		"activationEvent": "*"
	},
	"runtimeErrors": [
		{
			"name": "Error",
			"message": "ENOENT: no such file or directory, watch #PATH_TO_FILE'"
		}
	]
}

[Sertion]

Hey dmitriismitnov.

Thank you for the report.

Where you looking at a file that was removed from the disk when this error occurred?

[Sertion]

Thank you for your report. A fix will be uploaded to the marketplace shortly.