Fix missing filename when the 'Training History' button was clicked in TMVA-Gui (functionality added in pull request #4337)
Fix missing filename when the 'Training History' button was clicked in TMVA-Gui (functionality added in pull request #4337)

root-mirror/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root