Allow update of chores without tasks

[MariusWirtz]

Fixes #1308

[Copilot]

Pull Request Overview

This PR fixes a bug in the ChoreService.update() method and updates the corresponding test to use the correct test fixture. The changes address an UnboundLocalError that would occur when updating a chore with no tasks.

• Fixes UnboundLocalError when updating chores without tasks by initializing the loop variable i
• Updates test to use chore_name3 (chore without tasks) instead of chore_name1 (chore with tasks) for more accurate test coverage

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
TM1py/Services/ChoreService.py	Initializes loop variable i to prevent UnboundLocalError when iterating over empty task list
Tests/ChoreService_test.py	Updates test to use appropriate test fixture (chore_name3 without tasks) for testing chore updates without tasks

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