emqx4.3/changes/ee/fix-11547.en.md

Fix several emqx_bridge issues:

• fix Cassandra bridge connect error occurring when the bridge is configured without username/password (Cassandra doesn't require user credentials when it is configured with authenticator: AllowAllAuthenticator)
• fix SQL Server bridge connect error caused by an empty password
• make username a required field in Oracle bridge
• fix IoTDB bridge error caused by setting base URL without scheme (e.g. <host>:<port>)