[ROOT-10723] [TChain] Potential access to invalid fTree in TChain destructor - SFTJIRA

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The following sequence of calls results in c1 having a null fTree but a non-null fFile.

TChain* c1 = new TChain("T");

c1->Add("Event.root");

TChain* c2 = new TChain("T2");

c2->Add("Event2.root/T");

c1->AddFriend(c2);

c1->LoadTree(0);

c1->RemoveFriend(c2);

delete c1;

In this situation, ~TChain ended up calling TTree::GetReadCache on a null fTree.