Show info message when schema is empty

[barbaravaldez]

Fix #24852

[coveralls]

Pull Request Test Coverage Report for Build 6868503283

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• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.003%) to 41.573%

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Files with Coverage Reduction	New Missed Lines	%
extensions/notebook/src/dialog/configurePython/configurePathPage.ts	1	57.02%
src/sql/workbench/services/connection/browser/connectionDialogWidget.ts	1	73.44%

Totals
Change from base Build 6828665189:	0.003%
Covered Lines:	30786
Relevant Lines:	69355

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💛 - Coveralls