Fix crash when data is nil
Fix crash when data is nil

JinlianWang/OHHTTPStubs,Labradorom/OHHTTPStubs,sessuru/OHHTTPStubs,MaxGabriel/OHHTTPStubs,sessuru/OHHTTPStubs,HyprMXMobile/OHHTTPStubs,manuyavuz/OHHTTPStubs,kazmasaurus/OHHTTPStubs,liufeigit/OHHTTPStubs,HyprMXMobile/OHHTTPStubs,SummerHanada/OHHTTPStubs,kazmasaurus/OHHTTPStubs,tarbrain/OHHTTPStubs,tarbrain/OHHTTPStubs,SummerHanada/OHHTTPStubs,JinlianWang/OHHTTPStubs,tarbrain/OHHTTPStubs,virajs/OHHTTPStubs,ThomWee/OHHTTPStubs,bruceflowers/OHHTTPStubs,hirohisa/OHHTTPStubs,hirohisa/OHHTTPStubs,oenius/OHHTTPStubs,virajs/OHHTTPStubs,HyprMXMobile/OHHTTPStubs,ThomWee/OHHTTPStubs,SummerHanada/OHHTTPStubs,JinlianWang/OHHTTPStubs,ThomWee/OHHTTPStubs,oenius/OHHTTPStubs,ThomWee/OHHTTPStubs,SummerHanada/OHHTTPStubs,oenius/OHHTTPStubs,kazmasaurus/OHHTTPStubs,oenius/OHHTTPStubs,manuyavuz/OHHTTPStubs,HyprMXMobile/OHHTTPStubs,liufeigit/OHHTTPStubs,virajs/OHHTTPStubs,JinlianWang/OHHTTPStubs,virajs/OHHTTPStubs,hirohisa/OHHTTPStubs,bruceflowers/OHHTTPStubs,liufeigit/OHHTTPStubs,vladzz/OHHTTPStubs,tarbrain/OHHTTPStubs,manuyavuz/OHHTTPStubs,sessuru/OHHTTPStubs,hirohisa/OHHTTPStubs,bruceflowers/OHHTTPStubs