VP-3734 Fix error shown when user do not select any list on delete di…

[AliveMen]

Problem

When user do not select any list and press submit then 500 error shown.

Solution

Disable submit button if nothing selected
Check for array emptiness before use it

Make sure these boxes are checked:

• Check all the changes in github PR - files count (non of them are redundant, have meaningful changes, all are added), if target branch is correct
• Check methods and variable namings - it should be self descriptive, no typos
• Check you did not introduce breaking changes in API and public models/services.
• Respect extensibility - https://community.virtocommerce.com/t/extensibility-basics-the-domain-model-and-persistence-layer-extension/141
• Follow DRY and SOLID principles
• For unit tests - follow Microsoft best practices: https://docs.microsoft.com/en-us/dotnet/core/testing/unit-testing-best-practices
• Consolidate solution dependencies in case you are using newer version, update VC module dependencies in module.manifest. Do not upgrade 3rd party packages that are shipped with the platform with the version newer than in the platform.
• Check code style conventions - https://github.com/VirtoCommerce/styleguide/blob/master/csharp.md
• Check PR have a concise and descriptive title, follow git commit message rules