BUG: latest version (commit 4f0c5b1) no longer compiles without errors

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

none

Reproducible demo link

none

Describe the bug

yarn build fails with two errors:

ERROR in /Users/andreas/rozek/GitHub/grapesjs/test/specs/utils/Sorter.ts
438:19-35
[tsl] ERROR in /Users/andreas/rozek/GitHub/grapesjs/test/specs/utils/Sorter.ts(438,20)
      TS2532: Object is possibly 'undefined'.
ts-loader-default_4a384f05a8be7d44

ERROR in /Users/andreas/rozek/GitHub/grapesjs/test/specs/utils/Sorter.ts
489:19-35
[tsl] ERROR in /Users/andreas/rozek/GitHub/grapesjs/test/specs/utils/Sorter.ts(489,20)
      TS2532: Object is possibly 'undefined'.
ts-loader-default_4a384f05a8be7d44

This may just be a problem with TypeScript being too picky, because

1. you may disable the error messages using // @ts-ignore and compile again
2. the tests will run fine then.

but since I'm new to GrapesJS, I can not judge myself. Anyway, it's normally not a good idea to just // @ts-ignore TypeScript errors...

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