Fix empty command tasks not terminating by improving _isTaskEmpty logic

[Copilot]

Tasks with empty command strings ("command": "") were not terminating properly, causing them to run indefinitely with a progress indicator that never completed.

Root Cause

The _isTaskEmpty() method in TerminalTaskSystem was checking (task.command.name !== undefined) but not validating if the command was actually meaningful. Empty string commands were considered "not empty" because "" !== undefined is true, causing them to be processed as valid tasks that attempt terminal execution.

Fix

Modified _isTaskEmpty() to use CommandString.value() and check for non-empty trimmed content:

private _isTaskEmpty(task: CustomTask | ContributedTask): boolean {
    const isCustomExecution = (task.command.runtime === RuntimeType.CustomExecution);
    const hasValidCommandName = task.command.name !== undefined && CommandString.value(task.command.name).trim() !== '';
    return !((task.command !== undefined) && task.command.runtime && (isCustomExecution || hasValidCommandName));
}

Behavior After Fix

Empty command tasks now:

• Are correctly identified as empty tasks
• Fire TaskEventKind.End event immediately
• Return Promise.resolve({ exitCode: 0 }) without starting a terminal process
• Show as completed successfully in the VS Code UI

Test Case

This configuration from the original issue now works correctly:

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "Do Nothing in WSL",
            "command": "",
            "runOptions": {
                "runOn": "folderOpen"
            }
        }
    ]
}

The task terminates immediately instead of hanging indefinitely.

Fixes #173842.

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