Display a relevant warning in Web Console when tables query is an empty dataset

[insmac]

Is your feature request related to a problem?

By design, inability to fetch tables is a terminal error in Web Console - for one, it prevents SQL editor from booting up. This is because it indicates an issue with QuestDB host configuration in itself (for example, a not fully supported filesystem)

Describe the solution you'd like.

• Refactor the <Schema> component so that it displays a relevant error when table query response is an empty array (it should at the very least contain telemetry_config.
• Display a warning within the editor area itself.

Describe alternatives you've considered.

No response

Additional context.

No response