newclay.core: do not present context stack as part of error message if it is empty
newclay.core: do not present context stack as part of error message if it is empty

mario-campos/clay,mario-campos/clay,jckarter/clay,jckarter/clay,aep/clay,mario-campos/clay,jckarter/clay,iamrekcah/clay,iamrekcah/clay,aep/clay,mario-campos/clay,jckarter/clay,iamrekcah/clay,iamrekcah/clay,aep/clay,iamrekcah/clay,jckarter/clay,jckarter/clay,aep/clay,aep/clay,mario-campos/clay,aep/clay