feat(dashboard): zero line when no data found

[soleksy-splunk]

Issue number:
https://splunk.atlassian.net/browse/ADDON-76195

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Zero line is displayed when no data found for all dashboard charts, except those in resource tab.

Changes

For data charts where "No data found" message is displayed there is displayed chart with zero line, simulating none of the events to appear.

User experience

Please describe the user experience before and after this change. Screenshots are welcome for additional context.

Overview before changes:

Overview after changes:

Data Ingestion tab before changes:

Data Ingestion tab after changes:

Error tab before changes:

Error tab after changes:

Resource consumption tab after changes remains the same:

Checklist

If an item doesn't apply to your changes, leave it unchecked.

• I have performed a self-review of this change according to the development guidelines
• Tests have been added/modified to cover the changes (testing doc)
• Changes are documented
• PR title and description follows the contributing principles