Fix startup on empty workspace (#1289)

* Fix startup on empty workspace and add useful snippets

* Update CHANGELOG.md

Co-authored-by: Tyler Leonhardt (POWERSHELL) <tyleonha@microsoft.com>

Author: TylerLeonhardt

.vscode/snippets.code-snippets

@@ -0,0 +1,40 @@
+{
+	// Place your PowerShellEditorServices workspace snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and
+	// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope
+	// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is
+	// used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
+	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders.
+	// Placeholders with the same ids are connected.
+	// Example:
+	// "Print to console": {
+	// 	"scope": "javascript,typescript",
+	// 	"prefix": "log",
+	// 	"body": [
+	// 		"console.log('$1');",
+	// 		"$2"
+	// 	],
+	// 	"description": "Log output to console"
+	// }
+	// Use https://snippet-generator.app/ to generate snippets
+	"Wait for debugger to be attached": {
+		"prefix": "WaitForDebugger",
+		"body": [
+			"while (!System.Diagnostics.Debugger.IsAttached)",
+			"{",
+			"    System.Console.WriteLine(System.Diagnostics.Process.GetCurrentProcess().Id);",
+			"    System.Threading.Thread.Sleep(2000);",
+			"}"
+		],
+		"description": "Wait for debugger to be attached"
+	},
+	"Copyright header": {
+		"prefix": "CopyrightHeader",
+		"body": [
+			"//",
+			"// Copyright (c) Microsoft. All rights reserved.",
+			"// Licensed under the MIT license. See LICENSE file in the project root for full license information.",
+			"//"
+		],
+		"description": "Copyright header"
+	}
+}

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## v2.2.0-preview.2
 ### Wednesday, May 06, 2020
 
+- 🛫🐛  [PowerShellEditorServices #1289](https://github.com/PowerShell/PowerShellEditorServices/pull/1289) -
+  Fix startup on empty workspaces.
 - 🛫🐛 [PowerShellEditorServices #1285](https://github.com/PowerShell/PowerShellEditorServices/pull/1285) -
   Use API on ScriptBlock to generate PSCommand to run in ConstrainedLanguage mode.
 - ⚡️🧠 [PowerShellEditorServices #1283](https://github.com/PowerShell/PowerShellEditorServices/pull/1283) -

src/PowerShellEditorServices/Server/PsesLanguageServer.cs

@@ -102,7 +102,7 @@ public async Task StartAsync()
                             {
                                 workspaceService.WorkspacePath = request.RootUri.GetFileSystemPath();
                             }
-                            else
+                            else if (request.WorkspaceFolders != null)
                             {
                                 // If RootUri isn't set, try to use the first WorkspaceFolder.
                                 // TODO: Support multi-workspace.