Beams not rendered in measureless encodings (tablature)

[reinierdevalk]

Describe the problem
When making an encoding that has no division into <measure>s, any encoded <beam>s cause an error and make the example unable to render.

To Reproduce
Steps to reproduce the behavior:

1. Load the MEI files attached: one has no <beam>s and works as expected; the other has <beam>s and does not.
2. Render the files
3. See error message: Sorry, Verovio failed to process the MEI data. RangeError: Maximum call stack size exceeded.

Expected behavior
Beams to be rendered.

Input data
Minimal working examples are attached: verovio-issue_example-beams.zip

Verovio information

• Verovio 4.2.0-8a772f5

Environment information (as appropriate)

• OS: MacOS, Windows
• Browser: Chrome, Firefox