Tasks without command are added to instances

Part of #92792

src/vs/workbench/contrib/tasks/browser/terminalTaskSystem.ts

@@ -33,7 +33,7 @@ import { IOutputService } from 'vs/workbench/contrib/output/common/output';
 import { StartStopProblemCollector, WatchingProblemCollector, ProblemCollectorEventKind, ProblemHandlingStrategy } from 'vs/workbench/contrib/tasks/common/problemCollectors';
 import {
 	Task, CustomTask, ContributedTask, RevealKind, CommandOptions, ShellConfiguration, RuntimeType, PanelKind,
-	TaskEvent, TaskEventKind, ShellQuotingOptions, ShellQuoting, CommandString, CommandConfiguration, ExtensionTaskSource, TaskScope, RevealProblemKind, DependsOrder, TaskSourceKind
+	TaskEvent, TaskEventKind, ShellQuotingOptions, ShellQuoting, CommandString, CommandConfiguration, ExtensionTaskSource, TaskScope, RevealProblemKind, DependsOrder, TaskSourceKind, InMemoryTask
 } from 'vs/workbench/contrib/tasks/common/tasks';
 import {
 	ITaskSystem, ITaskSummary, ITaskExecuteResult, TaskExecuteKind, TaskError, TaskErrors, ITaskResolver,
@@ -250,10 +250,12 @@ export class TerminalTaskSystem implements ITaskSystem {
 			executeResult.promise.then(summary => {
 				this.lastTask = this.currentTask;
 			});
-			if (!this.instances[commonKey]) {
-				this.instances[commonKey] = new InstanceManager();
+			if (InMemoryTask.is(task) || !this.isTaskEmpty(task)) {
+				if (!this.instances[commonKey]) {
+					this.instances[commonKey] = new InstanceManager();
+				}
+				this.instances[commonKey].addInstance();
 			}
-			this.instances[commonKey].addInstance();
 			return executeResult;
 		} catch (error) {
 			if (error instanceof TaskError) {
@@ -606,8 +608,7 @@ export class TerminalTaskSystem implements ITaskSystem {
 		const resolvedVariables = this.resolveVariablesFromSet(systemInfo, workspaceFolder, task, variables, alreadyResolved);
 
 		return resolvedVariables.then((resolvedVariables) => {
-			const isCustomExecution = (task.command.runtime === RuntimeType.CustomExecution);
-			if (resolvedVariables && (task.command !== undefined) && task.command.runtime && (isCustomExecution || (task.command.name !== undefined))) {
+			if (resolvedVariables && !this.isTaskEmpty(task)) {
 				this.currentTask.resolvedVariables = resolvedVariables;
 				return this.executeInTerminal(task, trigger, new VariableResolver(workspaceFolder, systemInfo, resolvedVariables.variables, this.configurationResolverService), workspaceFolder);
 			} else {
@@ -620,6 +621,11 @@ export class TerminalTaskSystem implements ITaskSystem {
 		});
 	}
 
+	private isTaskEmpty(task: CustomTask | ContributedTask): boolean {
+		const isCustomExecution = (task.command.runtime === RuntimeType.CustomExecution);
+		return !((task.command !== undefined) && task.command.runtime && (isCustomExecution || (task.command.name !== undefined)));
+	}
+
 	private reexecuteCommand(task: CustomTask | ContributedTask, trigger: string, alreadyResolved: Map<string, string>): Promise<ITaskSummary> {
 		const lastTask = this.lastTask;
 		if (!lastTask) {