Add default empty string for KEYCLOAK_HOST to prevent None being passed to get_tenant_info

[prjanitor]

Bug Fix: Missing null check for KEYCLOAK_HOST

Problem

In taxonomy/taxonomy/token_dependency.py, the KEYCLOAK_HOST environment variable is retrieved without a default value:

KEYCLOAK_HOST = os.getenv("KEYCLOAK_HOST")

When KEYCLOAK_HOST is not set, os.getenv() returns None, which is then passed to get_tenant_info(url=KEYCLOAK_HOST, algorithm="RS256"). This can cause the function to fail or behave unexpectedly.

Solution

Add a default empty string value to prevent None from being passed:

KEYCLOAK_HOST = os.getenv("KEYCLOAK_HOST", "")

Impact

• Prevents potential runtime errors when KEYCLOAK_HOST is not configured
• Consistent with the pattern used in annotation/annotation/token_dependency.py
• Minimal change with no side effects

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[prjanitor]

Closing this PR -- after a closer review, we believe this change isn't correct. Apologies for the noise; we're still ironing out some kinks in our automated flow. Thanks for your patience!