bug fix: environment variable on default database

transport/__init__.py

@@ -61,8 +61,8 @@ class factory :
 		"console":{"class":{"write":Console,"read":Console}},
 		"file":{"class":{"read":disk.DiskReader,"write":disk.DiskWriter}},
 		"sqlite":{"class":{"read":disk.SQLiteReader,"write":disk.SQLiteWriter}},
-        "postgresql":{"port":5432,"host":"localhost","driver":pg,"default":{"type":"VARCHAR"},"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},
-        "redshift":{"port":5432,"host":"localhost","driver":pg,"default":{"type":"VARCHAR"},"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},
+        "postgresql":{"port":5432,"host":"localhost","database":None,"driver":pg,"default":{"type":"VARCHAR"},"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},
+        "redshift":{"port":5432,"host":"localhost","database":None,"driver":pg,"default":{"type":"VARCHAR"},"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},
         "bigquery":{"class":{"read":sql.BQReader,"write":sql.BQWriter}},
         "mysql":{"port":3306,"host":"localhost","default":{"type":"VARCHAR(256)"},"driver":my,"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},
         "mariadb":{"port":3306,"host":"localhost","default":{"type":"VARCHAR(256)"},"driver":my,"class":{"read":sql.SQLReader,"write":sql.SQLWriter}},