Property document is undefined

[ajsb85]

Hi @nexus-uw

I can see this error message in the devtools:

shell.ts:433 Cannot read property 'document' of undefined: TypeError: Cannot read property 'document' of undefined at C:\<extensions-path>\s3ramsay.vscode-gtm-0.1.2\out\src\extension.js:49:88

• VSCode Version: Code - Insiders 1.9.0-insider (39d761bf1f4ce7ea605539bdba41a8727b3c7ce0, 2017-01-18T07:10:04.990Z)
• OS Version: Windows_NT ia32 10.0.15007
• Extensions:

Extension	Author	Version
vscode-markdownlint	DavidAnson	0.6.1
jshint	dbaeumer	0.10.15
ghlink	dt	0.0.4
EditorConfig	EditorConfig	0.3.4
Theme-Zenburn	gerane	0.0.3
sass-lint	glen-84	0.0.3
vscode-commitizen	KnisterPeter	0.3.5
vscode-github	KnisterPeter	0.9.0
debugger-for-chrome	msjsdiag	2.4.2
vscode-docker	PeterJausovec	0.0.11
gitlink	qezhu	0.0.1
sass-indented	robinbentley	1.3.0
sharecode	RolandGreim	0.4.0
vscode-gtm	s3ramsay	0.1.2

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Steps to Reproduce:

1. Open the Extension list of the sidebar
2. Select any extension