fixed panic error when null collection received

[yesoreyeram]

• Fix panic when null collection received
• Added Format selector in the front end
• Defaults results to table format
• Remove automatic timeseries formatting
• Fixed a bug where hiding query doesn't honoured

[scottlepp]

Seems we are adding a new feature here, not just fixing the bug. We should really try keep these as separate prs.

"Remove automatic timeseries format". This is the convention in clickhouse, sqlyze, databricks and other sql plugins. The code here was from sqlds. I think we should be consistent. Is there a reason we did that?

So we need to revert that change, or update the read me.

[yesoreyeram]

makes sense to have separate PR. Closing this and will open a PR just for the panic. ( but still not convinced that we should remove the format selector. we can discuss that over #34 ).