Fix TypeScript null safety for client notifications

Author: tebjan

VSCode/vscode-extension/src/extension.ts

@@ -580,7 +580,7 @@ async function startLanguageServer(context: vscode.ExtensionContext): Promise<vo
                 if (e.affectsConfiguration('strideShaderTools.shaderPaths')) {
                     const updatedConfig = vscode.workspace.getConfiguration('strideShaderTools');
                     const paths = updatedConfig.get<string[]>('shaderPaths') ?? [];
-                    client.sendNotification('stride/updateShaderPaths', {
+                    client?.sendNotification('stride/updateShaderPaths', {
                         additionalShaderPaths: paths,
                     });
                 }
@@ -590,7 +590,7 @@ async function startLanguageServer(context: vscode.ExtensionContext): Promise<vo
         // Notify language server when workspace folders are added or removed
         context.subscriptions.push(
             vscode.workspace.onDidChangeWorkspaceFolders((e) => {
-                client.sendNotification('stride/updateWorkspaceFolders', {
+                client?.sendNotification('stride/updateWorkspaceFolders', {
                     added: e.added.map((f) => f.uri.fsPath),
                     removed: e.removed.map((f) => f.uri.fsPath),
                 });