message: Adding NULL vector as return value to make compilers happy
diff: @@ -94,11 +94,12 @@ public:
  /// Function for getting and setting the state vectors
  virtual int GetMaxStateSize() { return 0; }
  virtual int GetStateSize() { return 0; }
  - virtual void GetStateVector(int i, Vector &state)
  + virtual const Vector &GetStateVector(int i)
  {
  mfem_error("ODESolver has no state vectors");
  + Vector *s = NULL; return *s; // Make some compiler happy
  }
  - virtual const Vector &GetStateVector(int i)
  + virtual void GetStateVector(int i, Vector &state)
  {
  mfem_error("ODESolver has no state vectors");
  }
  @@ -646,6 +647,7 @@ public:
  virtual const Vector &GetStateVector(int i)
  {
  mfem_error("ODESolver has no state vectors");
  + Vector *s = NULL; return *s; // Make some compiler happy
  }
  virtual void GetStateVector(int i, Vector &state)
  {
  