Hide eye icon on error

[s9ferech]

Pull Request Description

This solves issue #1595. The eye icon on nodes will not be shown when the node is in an error state.

Important Notes

The will hide the whole action bar when there is an error. (There is only a single action at the moment.) If that behavior is not desired then some design decisions are necessary.

Checklist

Please include the following checklist in your PR:

• [x] The CHANGELOG.md was updated with the changes introduced in this PR.
• [x] The documentation has been updated if necessary.
• [x] All code conforms to the Rust style guide.
• [ ] All code has automatic tests where possible.
• [ ] All code has been profiled where possible.
• [x] All code has been manually tested in the IDE.
• [ ] All code has been manually tested in the "debug/interface" scene.
• [ ] All code has been manually tested by the PR owner against our test scenarios.
• [ ] All code has been manually tested by at least one reviewer against our test scenarios.