fix(tutorial): tiny improvements on weather warning application

[hoelger]

Description

Small fixes that arose when getting familiar with MOSAIC

Issue(s) related to this PR

• Resolves internal issue 885

Affected parts of the online documentation

Changes in the documentation required? No.

Definition of Done

Prerequisites

• You have read CONTRIBUTING.md carefully.
• You have signed the Contributor License Agreement.
• Your GitHub user id is linked with your Eclipse Account.

Required

• The title of this merge request follows the scheme type(scope): description (in the style of Conventional Commits)
• You have assigned a suitable label to this pull request (e.g., enhancement, or bugfix)
• origin/main has been merged into your Fork.
• Coding guidelines have been followed (see CONTRIBUTING.md).
• All checks on GitHub pass.
• All tests on Jenkins pass.

Requested (can be enforced by maintainers)

• New functionality is covered by unit tests or integration tests. Code coverage must not decrease.
• If a bug has been fixed, a new unit test has been written (beforehand) to prove misbehavior
• There are no new SpotBugs warnings.

Special notes to reviewer

[hoelger]

First finish the discussions in issue 885 and look if more code changes come up, then review and merge this PR

[kschrab]

@hoelger continuous integration was not successful, check BarnimReleaseIT