message: fix issue with copying an invalid OSPAny causing a crash
diff: @@ -97,7 +97,7 @@ namespace ospray {
  }
  inline OSPAny::OSPAny(const OSPAny &copy) :
  - currentValue(copy.currentValue->clone())
  + currentValue(copy.valid() ? copy.currentValue->clone() : nullptr)
  {
  }
  