Add defensive null/empty checks in externalDbUrl() for all standalone database models to prevent "invalid proto:" errors when server IP is not available.
**Problem:**
When `$this->destination->server->getIp` returns null or empty string, database URLs become malformed (e.g., `mongodb://user:pass@:27017` with empty host), causing "invalid proto:" validation errors.
**Solution:**
Added early return with null check in externalDbUrl() method for all 8 database types:
- Check if server IP is empty before building URL
- Return null instead of generating malformed URL
- Maintains graceful degradation - UI handles null URLs appropriately
**Defense in Depth:**
While mount() guard (from commit 74c70b431) prevents most cases, this adds an additional safety layer for edge cases:
- Race conditions during server updates
- State changes between mount and URL access
- Direct model access bypassing Livewire lifecycle
**Affected Models:**
- StandaloneMongodb
- StandalonePostgresql
- StandaloneMysql
- StandaloneMariadb
- StandaloneClickhouse
- StandaloneRedis
- StandaloneKeydb
- StandaloneDragonfly
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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