Don't break socket connections for postgres

Also, use dict.get() for default values.

Author: sur5r

dbbackup/db/postgresql.py

@@ -8,10 +8,10 @@
 
 
 def create_postgres_uri(self):
-    host = self.settings.get("HOST") or "localhost"
-    dbname = self.settings.get("NAME") or ""
+    host = self.settings.get("HOST", "localhost")
+    dbname = self.settings.get("NAME", "")
     user = quote(self.settings.get("USER") or "")
-    password = self.settings.get("PASSWORD") or ""
+    password = self.settings.get("PASSWORD", "")
     password = f":{quote(password)}" if password else ""
     if not user:
         password = ""

docs/changelog.rst

@@ -4,7 +4,7 @@ Changelog
 Unreleased
 ----------
 
-* Nothing (yet)!
+* Empty string as HOST for postgres unix domain socket connection is now supported.
 
 4.2.1 (2024-08-23)
 ----------