fix(mcp): skip workspace folders without a path

[utkarshkgithub]

Fixes #310371

Problem

watchFolder() calls joinPath(folder.uri, '.cursor', 'mcp.json') without checking if the URI has a path.

In virtual/remote workspace scenarios, folder.uri.path can be empty, causing:
[UriError]: cannot call joinPath on URI without path

Solution

Add a guard to skip workspace folders that do not have a path component.

Changes

• Added early return in watchFolder() when folder.uri.path is falsy

Testing

• Verified VS Code runs normally after the change
• Ensured no crash occurs when workspace folders without paths are processed

[Copilot]

Pull request overview

Fixes a crash in MCP workspace discovery by avoiding joinPath(...) on workspace folder URIs that have no path component (common in some virtual/remote workspace scenarios).

Changes:

• Added a guard in watchFolder() to skip workspace folders whose folder.uri.path is empty.

[Copilot]

Spacing in the new guard doesn’t match the repo’s TypeScript style (and may trip eslint rules like keyword-spacing/space-before-blocks). Please format as if (!folder.uri.path) { ... } (spaces after if, around !, and before {).

Suggested change

	if(!folder.uri.path){
	if (!folder.uri.path) {