Hi Renato,
In their website they always have a post cover, but the rss not always come with it or easyblog don't detect it
Can you provide us with the rss feed link so we can tried this issue locally.
he best option would be to prevent to post it, but if there's no option to prevent... I'll have to keep with this...
Another solution would be: Can I set a default image if the rss don't detect one? It would be also a workaround solution
Unfortunately, there is no option for this currently. However, this is a great idea, perhaps, you can create a ticket under feature request so our developer can keep track feature that might be can implement in the future.