Missing SSH config is not handled

[slagiewka]

Scenario:

• Clean OS install
• ~/.ssh is empty or doesn't have config file.
• Trying to attach VScode to a node fails

Steps to fix:
touch ~/.ssh/config.

Empty config file works and gets written to (if request by the user).

When trying to attach VSCode to a node:

[error] EntryNotFound (FileSystemError): Error: ENOENT: no such file or directory, open '/home/{user}/.ssh/config'
	at y.e (/app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:127:26740)
	at Object.readFile (/app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:127:25126)
	at async c (/home/{user}/.var/app/com.visualstudio.code/data/vscode/extensions/tailscale.vscode-tailscale-1.0.0/dist/extension.js:2:347328)
	at async t.syncSSHConfig (/home/{user}/.var/app/com.visualstudio.code/data/vscode/extensions/tailscale.vscode-tailscale-1.0.0/dist/extension.js:2:348134)
	at async /home/{user}/.var/app/com.visualstudio.code/data/vscode/extensions/tailscale.vscode-tailscale-1.0.0/dist/extension.js:2:326085
	at async i.h (/app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:125:139661) tailscale.node.openRemoteCode {"value":"Tailscale.vscode-tailscale","_lower":"tailscale.vscode-tailscale"}