Update connection.ts

[hanlaman]

References

Incorrect disposal of LSP connection due to access to undefined serverRequests jupyterlab#16185

Code changes

dispose(): void {
if (this.isDisposed) {
return;
}

// Check if serverRequests is defined before accessing its values
if (this.serverRequests) {
Object.values(this.serverRequests).forEach(request =>
request.clearHandler()
);
}

// Other disposal logic here
}

Modified the dispose() method in connection.ts to include a check for this.serverRequests before accessing its values during disposal.

Added a conditional check to ensure that connections are disposed only if serverRequests is defined, preventing the TypeError on kernel switching.