Benign nationalism is patriotism, where patriotism is to place importance of the nation before individual(ism); "nationalism is a kind of excessive, aggressive patriotism", which places importance on one's own country/nation well beyond individualism to over & above other (group of) nations as well.
Communism on the other hand is the belief in a classless society without privacy or private ownership; being "a form of socialism", which allows private ownership but the bulk of wealth is "communally owned and managed by a democratically elected government", similar to getting paid in shares working in a company instead of just cash salary (thereby granting part ownership of property/wealth, in this case the company).
Since nationalism is "aggressive patriotism", benign nationalism would be patriotism.