delete interval from intervalQueries when is empty to create interval on new subscription
delete interval from intervalQueries when is empty to create interval on new subscription

apollographql/apollo-client,apollostack/apollo-client,apollographql/apollo-client,calebmer/apollo-client,apollostack/apollo-client,cesarsolorzano/apollo-client,calebmer/apollo-client,stevewillard/apollo-client,stevewillard/apollo-client,cesarsolorzano/apollo-client,stevewillard/apollo-client,cesarsolorzano/apollo-client,calebmer/apollo-client,apollostack/apollo-client