Add a missing return.

1Weather/Extensions/UIApplication+Settings.swift

@@ -14,6 +14,7 @@ extension UIApplication {
             let appSettingsURL = URL(string: UIApplication.openSettingsURLString + bundleIdentifier)
         else {
             assert(false, "Failed to create settings URL from: \(UIApplication.openSettingsURLString)")
+            return
         }
         
         UIApplication.shared.open(appSettingsURL)