Inconsistent DisplayName is generated for a Collection used as the only parameter #684

[Markoutte]

Description

This fix adds a case when some values present but no description is supplied for them.

Also, small cleanup because capitalize is deprecated.

Fixes #684

Type of Change

• Minor bug fix (non-breaking small changes)

How Has This Been Tested?

Manual Scenario

Try to run example from the issues. The new description should be generated with phrase "with generated values".

Checklist:

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• New tests have been added
• All tests pass locally with my changes

[onewhl]

Thanks for the fix!