Fix debug configuration selection cancellation. (#7763)

Author: sean-mcmanus

Extension/CHANGELOG.md

@@ -19,6 +19,7 @@
 
 ### Bug Fixes
 * Fix code folding causing `} else if` lines to be hidden. [#5521](https://github.com/microsoft/vscode-cpptools/issues/5521)
+* Fix empty `launch.json` being created when debug configuration selection is canceled. [#7517](https://github.com/microsoft/vscode-cpptools/issues/7517)
 * Fix Find All References on a global variable giving incorrect references to local variables. [#7702](https://github.com/microsoft/vscode-cpptools/issues/7702)
 * Fix `vcFormat` not working near the end of the file with UTF-8 characters > 1 byte. [#7704](https://github.com/microsoft/vscode-cpptools/issues/7704)
 * Fix configuration squiggle on a recursively resolved `forcedInclude`. [PR #7722](https://github.com/microsoft/vscode-cpptools/pull/7722)

Extension/src/Debugger/configurationProvider.ts

@@ -71,7 +71,7 @@ export class QuickPickConfigurationProvider implements vscode.DebugConfiguration
 
         const selection: MenuItem | undefined = await vscode.window.showQuickPick(items, {placeHolder: localize("select.configuration", "Select a configuration")});
         if (!selection) {
-            return []; // User canceled it.
+            throw Error(localize("debug.configuration.selection.canceled", "Debug configuration selection canceled")); // User canceled it.
         }
         if (selection.label.startsWith("cl.exe")) {
             if (!process.env.DevEnvDir) {