Fix issue with empty refined actions locking up store

Author: Qata

Sources/RecombinePackage/Store/BaseStore.swift

@@ -67,7 +67,6 @@ public class BaseStore<State: Equatable, RawAction, RefinedAction>: StoreProtoco
         .map { actions, previousState in
             actions.flatMap { middleware.transform(previousState, $0) }
         }
-        .filter { !$0.isEmpty }
         .scan(state) { state, actions in
             actions.reduce(state, reducer.reduce)
         }

Tests/RecombineTests/StoreMiddlewareTests.swift

@@ -16,7 +16,8 @@ class StoreMiddlewareTests: XCTestCase {
             publishOn: ImmediateScheduler.shared
         )
         let action = TestFakes.SetAction.string("OK")
-        store.dispatch(raw: action)
+        store.dispatch(refined: [])
+        store.dispatch(refined: action)
 
         XCTAssertEqual(store.state.value, "OK First Middleware Second Middleware")
     }