PostgreSQL not working in DB Manager (Fix #8191)

Author: m-kuhn

python/plugins/db_manager/db_plugins/postgis/plugin.py

@@ -85,7 +85,7 @@ def connect(self, parent=None):
 
 		settings.endGroup()
 
-		if service != "":
+		if service:
 			uri.setConnection(service, database, username, password, sslmode)
 		else:
 			uri.setConnection(host, port, database, username, password, sslmode)