## Context
In database/tables (Schema visualizer), if the schema has no tables,
clicking on "Auto layout" causes a client error as we're trying to run
the `dagre.layout` on a graph with 0 nodes and edges
Opting to hide all actions on the Schema Visualizer if there's no tables
(understandably we've been leaning towards disabled states rather than
hiding, but in this case i was thinking hiding is better since that's an
empty state - unless some actions were applicable in the empty state,
but in this case none of the actions are)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
## Release Notes
* **Bug Fixes**
* Improved reliability of the database schema interface by strengthening
empty state handling
* Ensured database actions are properly hidden when no tables exist in
the schema
* **Refactor**
* Consolidated schema state validation logic for better code
maintainability
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Joshen Lim
b77de2dfbc