fix(Clusters): filter empty DC

[artemmufazalov]

For some reason DC list could contain empty strings - filter them

CI Results

Test Status: ⚠️ FLAKY

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
336	333	0	2	1

Test Changes Summary ⏭️1

⏭️ Skipped Tests (1)

1. Scroll to row, get shareable link, navigate to URL and verify row is scrolled into view (tenant/diagnostics/tabs/queries.test.ts)

Bundle Size: ✅

Current: 83.90 MB | Main: 83.90 MB
Diff: +0.15 KB (0.00%)

✅ Bundle size unchanged.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
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• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.