* comparing to nil works when done from within isEmpty so simplified the code like suggested here https://github.com/RxSwiftCommunity/RxSwift-Ext/issues/2#issuecomment-210576369
* comparing to nil works when done from within isEmpty so simplified the code like suggested here https://github.com/RxSwiftCommunity/RxSwift-Ext/issues/2#issuecomment-210576369

RxSwiftCommunity/RxSwift-Ext,RxSwiftCommunity/RxSwiftExt,RxSwiftCommunity/RxSwiftExt,RxSwiftCommunity/RxSwift-Ext,tgyhlsb/RxSwiftExt,RxSwiftCommunity/RxSwiftExt,tgyhlsb/RxSwiftExt