follow up: fix the bug in IsOpen

src/THcOnlineRun.h

@@ -38,14 +38,14 @@ public:
     virtual Int_t Attach(et_stat_id sid);
     virtual Int_t Detach();
 
-    virtual Bool_t IsOpen() const { return (et_id == nullptr) || (et_alive(et_id) > 0); }
+    virtual Bool_t IsOpen() const { return (et_id != nullptr) && et_alive(et_id); }
 
     virtual const UInt_t *GetEvBuffer() const { return buffer; }
     virtual const UInt_t &GetEvLength() const { return eSize; }
     virtual Int_t ReadEvent();
-    virtual Int_t SkipToEndOfFile(Int_t skip_max = -1) { return 1; };
+    virtual Int_t SkipToEndOfFile(Int_t skip_max = -1) { return 1; }
     virtual Int_t GetDataVersion() { return version; }
-    virtual Int_t SetDataVersion(Int_t vers) { version = vers; }
+    virtual Int_t SetDataVersion(Int_t vers) { version = vers; return 1; }
 
 private:
     bool copyEvent();