FIX #4758 PHP warning when installing to PostgreSQL with incorrect credentials

Closes #4758

htdocs/core/db/pgsql.class.php

@@ -412,8 +412,8 @@ class DoliDBPgsql extends DoliDB
 		{
 			$this->database_name = $name;
 			pg_set_error_verbosity($this->db, PGSQL_ERRORS_VERBOSE);	// Set verbosity to max
-		}
 			pg_query($this->db, "set datestyle = 'ISO, YMD';");
+		}
 
 		return $this->db;
 	}