Rules: use a View's result as a condition?
Even though your own answer is indeed a way to solve your question, it doesn't say that for this to work, it requires the Conditional Rules module to be enabled (without that, you cannot add a Rules Condition as an extra rules Action).

An alternative solution to solve your question, is to use the Views Bulk Operations (VBO) module to transform your view into a VBO view, so that you can use a Rules Condition "Check number of results returned by a VBO View" in which you can perfectly construct the Rules Condition you're looking for.

Have a look at "this answer" for an illustration of how this specific Rules Condition is used.

PS: I'm assuming this question is about D7.