fix throwOnMissing logic in ObjectSelectorBase

Author: mmusich

CommonTools/UtilAlgos/interface/ObjectSelectorBase.h

@@ -40,7 +40,7 @@ class ObjectSelectorBase : public Base {
         srcToken_(
             this->template consumes<typename Selector::collection>(cfg.template getParameter<edm::InputTag>("src"))),
         filter_(false),
-        throwOnMissing_(cfg.template getUntrackedParameter<bool>("throwOnMissing", true)),
+        throwOnMissing_(cfg.getUntrackedParameter<bool>("throwOnMissing", true)),
         selectorInit_(this->consumesCollector()),
         selector_(cfg, this->consumesCollector()),
         sizeSelector_(reco::modules::make<SizeSelector>(cfg)),
@@ -69,10 +69,13 @@ class ObjectSelectorBase : public Base {
   bool filter(edm::Event& evt, const edm::EventSetup& es) override {
     selectorInit_.init(selector_, evt, es);
     edm::Handle<typename Selector::collection> source;
+    evt.getByToken(srcToken_, source);
+    // if throwOnMissing is false, but the input source is not valid
+    // allow all events to pass
     if (!throwOnMissing_ && !source.isValid()) {
       return !filter_;
     }
-    evt.getByToken(srcToken_, source);
+
     StoreManager manager(source);
     selector_.select(source, evt, es);
     manager.cloneAndStore(selector_.begin(), selector_.end(), evt);