From Philippe: This patchs avoid crashing if the name of the TEventList used in TTree::Draw refers to an existing non-TEventList object. For example:    ntuple->Draw("px>>elist"); ntuple->Draw(">>elist"); was crashing and now issues:    Error in <TSelectorDraw::Begin>: An object of type 'TH1F' has the same name as the requested event list (elist)
From Philippe:
This patchs avoid crashing if the name of the TEventList used in TTree::Draw
refers to an existing non-TEventList object.
For example:
   ntuple->Draw("px>>elist"); ntuple->Draw(">>elist");
was crashing and now issues:
   Error in <TSelectorDraw::Begin>: An object of type 'TH1F' has the same name as the requested event list (elist)


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@9379 27541ba8-7e3a-0410-8455-c3a389f83636

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