Fix returning connection params in get_parameters() with empty default

"options" and "tty" were returned even if they were set to their
default.

diff --git a/psycopg/psycopg/conninfo.py b/psycopg/psycopg/conninfo.py
index 3d665c94b7c2e724c07e0a26239d364454849b35..9dfff13397a480b54fcfbb838a49d01dff1a8fc5 100644 (file)
--- a/psycopg/psycopg/conninfo.py
+++ b/psycopg/psycopg/conninfo.py
@@ -170,7 +170,7 @@ class ConnectionInfo:
         defaults = {
             i.keyword: i.compiled
             for i in pq.Conninfo.get_defaults()
-            if i.compiled
+            if i.compiled is not None
         }
         # Not returned by the libq. Bug? Bet we're using SSH.
         defaults.setdefault(b"channel_binding", b"prefer")