Next-Gen Roadmap should load the 300 epics with limit, instead of error message "Too many epics to display the roadmap"

Next-Gen Roadmap should load the 300 epics with limit, instead of the error message below:

"*Too many epics to display the roadmap*"
Your roadmap isn't available because the project contains over 300 epics. You must reduce the number of epics to continue using your roadmap. 

Perhaps we can add a limit of 300 at the end of the REST API that pulls the epic, replacing this blocker message to another one. E.g.: Only 300 Epics were loaded because of the 300 Epics limit.

Besides, should be nice to add a warning message when we are reaching the 300 Epic limit in Next-Gen project. For example, follows his video where I've added 300 Epic, and did not appear a warning before of this error.