dstandish commented on a change in pull request #19530:
URL: https://github.com/apache/airflow/pull/19530#discussion_r747158459



##########
File path: airflow/providers/salesforce/hooks/salesforce.py
##########
@@ -131,22 +131,39 @@ def get_conn(self) -> api.Salesforce:
         if not self.conn:
             connection = self.get_connection(self.conn_id)
             extras = connection.extra_dejson
+            # all extras below (besides the version one) are explicitly 
defaulted to None
+            # because simple-salesforce has a built-in authentication-choosing 
method that
+            # relies on which arguments are None and without "or None" setting 
this connection
+            # in the UI will result in the blank extras being empty strings 
instead of None,
+            # which would break the connection if "get" was used on its own.
             self.conn = Salesforce(
                 username=connection.login,
                 password=connection.password,
-                security_token=extras["extra__salesforce__security_token"] or 
None,
-                domain=extras["extra__salesforce__domain"] or None,
+                security_token=extras.get('security_token')

Review comment:
       that would probably be best.  i think it would make this PR 
uncontroversial.




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