The second syntax won't work because of the nested single quotation marks. The first syntax should work in a View of terms. Can you provide login credentials and tell me where to find this on the front-end?
This is exactly what I have, for reference:
Conditional: [wpv-conditional if="('[types termmeta="book-tax-wysiwyg-1" output="raw"]' ne '')"]it is not empty[/wpv-conditional]
Conditional 2: [wpv-conditional if="('[types termmeta="book-tax-wysiwyg-1" output="raw"]' eq '')"]it is empty[/wpv-conditional]
Okay I see, the solution I had in place only works in simple cases, and certain combinations of quotation marks break the conditional. I'll have to continue working on this tomorrow, I just wanted to give you a quick update.
It turns out there is a known issue with special characters in conditionals: https://wp-types.com/errata/conditionals-including-special-characters-might-fail/
I believe that's why the conditionals here are failing inconsistently between us. In your case, I temporarily deleted most of the content in your WYSIWYG field to remove all quotation marks, and you can see the output here is more like I would expect. I replaced the content for now. It seems that the core issue is the same as the erratum post above, so I have connected this ticket with our internal ticket to resolve that issue. I will keep you posted here as I receive more information. In the meantime, the only workaround I am aware of is to remove special characters from these WYSIWYG fields, or replace " with " in the text content.
Quick note: Blocks 1.3 / Views 3.3 have been released, and the updated plugins include improvements to the conditional parser system, including a fix for checking for empty tem fields and term fields with special characters.