Don't crash if cannot persist settings

            if (DEBUG_PERSISTENCE) {

                Slog.i(LOG_TAG, "[PERSIST END]");

            }

            // Any error while writing is fatal.

        } catch (Throwable t) {

            Slog.wtf(LOG_TAG, "Failed to write settings, restoring backup", t);

            destination.failWrite(out);

            throw new IllegalStateException("Failed to write settings, restoring backup", t);

        } finally {

            IoUtils.closeQuietly(out);

        }