Remove guard assertions (#421)

Author: tinder-cfuller

Sources/Nodes/Classes/AbstractContext.swift

@@ -101,10 +101,7 @@ open class AbstractContext<CancellableType: Cancellable>: Context {
     ///   This method is called internally within the framework code.
     public final func activate() {
         guard !isActive
-        else {
-            assertionFailure("Unable to activate")
-            return
-        }
+        else { return }
         isActive = true
         didBecomeActive()
         workerController.startWorkers()
@@ -116,10 +113,7 @@ open class AbstractContext<CancellableType: Cancellable>: Context {
     ///   This method is called internally within the framework code.
     public final func deactivate() {
         guard isActive
-        else {
-            assertionFailure("Unable to deactivate")
-            return
-        }
+        else { return }
         workerController.stopWorkers()
         willResignActive()
         cancellables.forEach { cancellable in

Sources/Nodes/Classes/AbstractFlow.swift

@@ -142,10 +142,7 @@ open class AbstractFlow<ContextInterfaceType, ViewControllerType>: Flow {
     ///   This method is called internally within the framework code.
     public final func start() {
         guard !isStarted
-        else {
-            assertionFailure("Unable to start")
-            return
-        }
+        else { return }
         #if DEBUG
         DebugInformation.FlowWillStartNotification(flow: self, viewController: viewController as AnyObject).post()
         #endif
@@ -159,10 +156,7 @@ open class AbstractFlow<ContextInterfaceType, ViewControllerType>: Flow {
     ///   This method is called internally within the framework code.
     public final func end() {
         guard isStarted
-        else {
-            assertionFailure("Unable to end")
-            return
-        }
+        else { return }
         _context.deactivate()
         #if DEBUG
         DebugInformation.FlowDidEndNotification(flow: self).post()

Sources/Nodes/Classes/AbstractWorker.swift

@@ -68,10 +68,7 @@ open class AbstractWorker<CancellableType: Cancellable>: Worker {
     ///   This method is called internally within the framework code.
     public final func start() {
         guard !isWorking
-        else {
-            assertionFailure("Unable to start")
-            return
-        }
+        else { return }
         isWorking = true
         didStart()
     }
@@ -82,10 +79,7 @@ open class AbstractWorker<CancellableType: Cancellable>: Worker {
     ///   This method is called internally within the framework code.
     public final func stop() {
         guard isWorking
-        else {
-            assertionFailure("Unable to stop")
-            return
-        }
+        else { return }
         willStop()
         cancellables.forEach { cancellable in
             cancellable.cancel()