ignore dpSupplementalMessage if it is an error - fix proposal for #1563

[lekma]

Check if this PR fulfills these requirements:

• [x] My changes respect the Kodi add-on development rules
• [x] I have read the CONTRIBUTING document.
• [x] I made sure there wasn't another Pull Request opened for the same update/change
• [x] I have successfully tested my changes locally

Types of changes

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Feature change (non-breaking change which changes behaviour of an existing functionality)
• [ ] Improvement (non-breaking change which improves functionality)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Refactor (non-breaking performance or readability improvements)

Description

proposal for fixing CastagnaIT/plugin.video.netflix#1563

In case of Feature change / Breaking change:

Describe the current behavior

Describe the new behavior

Screenshots (if appropriate):

[bilias]

This didn't work for me. Latest libreelec 10.0.4 kodi 19.5

I don't have problem on My list, but all rest of menus

[CastagnaIT]

thanks for the help its the correct solution