NodeUI - Improve error message handling

[Donatas-MN]

Currently errors displayed in UI are not informative, e.g. "Unknow API error" etc.

Tasks:

• [ ] Add error returned from API to UI message.
• [ ] Maybe to have a separate place (called by clicking some button) to collect errors.

Example: Error message: "Name value cannot be null".

Message in UI: Name value cannot be null.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed because it has not had activity for a long time. If this issue is still valid, please ping a maintainer and ask them to label it as "pinned". Thank you for your contributions.