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+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>`)