Fixes a problem I encountered while testing run/debug

Extension/src/LanguageServer/cppBuildTaskProvider.ts

@@ -222,7 +222,7 @@ export class CppBuildTaskProvider implements TaskProvider {
             const cppBuildTask: CppBuildTask = new Task(definition, TaskScope.Workspace, task.label, ext.CppSourceStr);
             cppBuildTask.detail = task.detail;
             cppBuildTask.existing = true;
-            if (task.group.isDefault) {
+            if (!util.isString(task.group) && task.group?.isDefault) {
                 cppBuildTask.isDefault = true;
             }
             return cppBuildTask;
@@ -260,8 +260,8 @@ export class CppBuildTaskProvider implements TaskProvider {
         // Modify the current default task
         rawTasksJson.tasks.forEach((task: any) => {
             if (task.label === selectedTask?.definition.label) {
-                task.group = { kind: "build", "isDefault": true };
-            } else if (task.group.kind && task.group.kind === "build" && task.group.isDefault && task.group.isDefault === true) {
+                task.group = { kind: "build", isDefault: true };
+            } else if (!util.isString(task.group) && task.group?.kind === "build" && task.group?.isDefault) {
                 task.group = "build";
             }
         });
@@ -270,7 +270,7 @@ export class CppBuildTaskProvider implements TaskProvider {
             const newTask: any = {
                 ...selectedTask.definition,
                 problemMatcher: selectedTask.problemMatchers,
-                group: { kind: "build", "isDefault": true },
+                group: { kind: "build", isDefault: true },
                 detail: localize("task_generated_by_debugger", "Task generated by Debugger.")
             };
             rawTasksJson.tasks.push(newTask);