Added return null to method FindClass when parameter class name is null or empty
Added return null to method FindClass when parameter class name is null or empty

u255436/CppSharp,mono/CppSharp,genuinelucifer/CppSharp,Samana/CppSharp,imazen/CppSharp,Samana/CppSharp,xistoso/CppSharp,mydogisbox/CppSharp,u255436/CppSharp,Samana/CppSharp,imazen/CppSharp,KonajuGames/CppSharp,mono/CppSharp,mydogisbox/CppSharp,mohtamohit/CppSharp,txdv/CppSharp,inordertotest/CppSharp,ddobrev/CppSharp,SonyaSa/CppSharp,imazen/CppSharp,ddobrev/CppSharp,txdv/CppSharp,zillemarco/CppSharp,ktopouzi/CppSharp,zillemarco/CppSharp,zillemarco/CppSharp,inordertotest/CppSharp,SonyaSa/CppSharp,ktopouzi/CppSharp,txdv/CppSharp,mohtamohit/CppSharp,SonyaSa/CppSharp,imazen/CppSharp,inordertotest/CppSharp,inordertotest/CppSharp,genuinelucifer/CppSharp,xistoso/CppSharp,KonajuGames/CppSharp,inordertotest/CppSharp,mono/CppSharp,imazen/CppSharp,txdv/CppSharp,xistoso/CppSharp,KonajuGames/CppSharp,genuinelucifer/CppSharp,nalkaro/CppSharp,mydogisbox/CppSharp,genuinelucifer/CppSharp,KonajuGames/CppSharp,nalkaro/CppSharp,mono/CppSharp,SonyaSa/CppSharp,mohtamohit/CppSharp,Samana/CppSharp,genuinelucifer/CppSharp,mydogisbox/CppSharp,mono/CppSharp,mono/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,xistoso/CppSharp,ktopouzi/CppSharp,ktopouzi/CppSharp,mohtamohit/CppSharp,nalkaro/CppSharp,u255436/CppSharp,zillemarco/CppSharp,SonyaSa/CppSharp,mydogisbox/CppSharp,mohtamohit/CppSharp,ddobrev/CppSharp,ddobrev/CppSharp,xistoso/CppSharp,nalkaro/CppSharp,u255436/CppSharp,u255436/CppSharp,Samana/CppSharp,KonajuGames/CppSharp,txdv/CppSharp,nalkaro/CppSharp,ktopouzi/CppSharp