<div id="comment:0"></div> using `try...except`, as previously done for these methods in `TensorFreeModule`, `VectorFieldFreeModule` CC: @egourgoulhon Component: **manifolds** Author: **Matthias Koeppe** Branch/Commit: **[`0d2539a`](https://github.com/sagemath/sagetrac-mirror/commit/0d2539a6fe4a7786181f40436c9c0272e2d419ac)** Reviewer: **Eric Gourgoulhon** _Issue created by migration from https://trac.sagemath.org/ticket/34486_