git subrepo pull (merge) ore

subrepo:
  subdir:   "ore"
  merged:   "094582c071"
upstream:
  origin:   "git@gitlab.acadiasoft.net:qs/ore.git"
  branch:   "master"
  commit:   "3c854df137"
git-subrepo:
  version:  "0.4.6"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "73a0129"

Author: jenkins

OREData/ored/portfolio/compositetrade.cpp

@@ -38,6 +38,7 @@ void CompositeTrade::build(const QuantLib::ext::shared_ptr<EngineFactory>& engin
     fxRates_.clear();
     fxRatesNotional_.clear();
     legs_.clear();
+    QL_REQUIRE(trades_.size() > 0, "Failed to build composite trade.");
     for (const QuantLib::ext::shared_ptr<Trade>& trade : trades_) {
 
 	trade->reset();