Comment 8 for bug 1653184

A bit more critical for the inkscape-docs project because the bug prevents the calligraphy tutorial from being generated (see Bug #1651815, comment #8 to #16).

Some local testings seem to show that the warning are caused by text content in the linked object. In the calligraphy tutorial, the object is a text element. In the symbols, we have a title element. Manually removing its content (the "Coat Check" text in the attached file) also removes the warnings (even if the element itself is kept).