[Saved screen] Added the test for empty state and refactor

[LinX64]

This PR is about the test for EmptyState() function.

I basically removed the unused windowSizeClass variable, and added the check for both Texts for the EmptyState(). I was also looking for a test function to check if All elements/Composables are available or not, but I wasn't able to find it; Something like:

onAllNodesExists()

Which should obviously receive the ids/strings of the elements/Composable.

Any thoughts would be appreciated :)