Fix: Early-return an empty string_view when packet is empty.

Author: Gogoshika-ga

source/gameanalytics/Http/GAHttpWrapper.h

@@ -15,6 +15,7 @@ namespace gameanalytics
 
                 inline std::string_view toString() const
                 {
+                    if(packet.empty()) return {};
                     return std::string_view((const char*)packet.data(), packet.size());
                 }
             };