allow empty string in saml metadata url

[Ellba]

I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

SAML metadata URL cannot be saved with an empty string; it works through the management API

What is the new behavior?

Allow saving SAML 2.0 config with an empty SAML metadata URL

[supabase]

This pull request has been ignored for the connected project xguihxuzqibwxjnimxev because there are no changes detected in supabase directory. You can change this behaviour in Project Integrations Settings ↗︎.

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[github-actions]

🎭 Playwright Test Results

 175 passed
 1 flaky
 4 skipped

Details

 180 tests across 20 suites
 3 minutes, 56 seconds
 b43d8dc

Flaky tests

Features › queue-table-operations.spec.ts › Queue Table Operations › pending changes persist when switching between tables

Skipped tests

Features › sql-editor.spec.ts › SQL Editor › snippet favourite works as expected
Features › sql-editor.spec.ts › SQL Editor › share with team works as expected
Features › sql-editor.spec.ts › SQL Editor › folders works as expected
Features › sql-editor.spec.ts › SQL Editor › other SQL snippets actions work as expected