message: remove checking for input tree in the task
  this is very old behaviour - nowadays we check if we have data
  vie handler->GetEvent()
diff: @@ -91,6 +91,7 @@ void AliTPCAnalysisTaskcalib::Exec(Option_t *) {
  }
  fVfriend=fV->FindFriend();
  +
  Int_t n=fV->GetNumberOfTracks();
  Process(fV);
  if (!fVfriend) {
  @@ -119,11 +120,6 @@ void AliTPCAnalysisTaskcalib::ConnectInputData(Option_t *) {
  //
  //
  //
  - TTree* tree=dynamic_cast<TTree*>(GetInputData(0));
  - if (!tree) {
  - Printf("ERROR: Could not read chain from input slot 0");
  - }
  - else {
  AliVEventHandler *vH = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
  //TString classInputHandler = vH->ClassName();
  if (!vH) {
  @@ -131,12 +127,11 @@ void AliTPCAnalysisTaskcalib::ConnectInputData(Option_t *) {
  }
  else {
  fV = vH->GetEvent();
  - if(!fV) Printf("ERROR: no V event!");
  + if(!fV) Printf("AliTPCAnalysisTaskcalib: ERROR: no V event!");
  //if (fV) {Printf("*** CONNECTED NEW EVENT ****");}
  }
  }
  -}
  void AliTPCAnalysisTaskcalib::CreateOutputObjects() {
  //
  