Use templated function TDirectory::Get<T>

Since ROOT 6.18 the function TDirectory::Get(const char*) exist which either returns a properly checked and casted object from a TFile/TDirectory or returns a nullptr.

Test if the object exist after is was read from file and stop the execution if the object doesn't exist.

Also tests which checks if a valid file pointer exist were added at several places.

added BugFix label

requested review from @v.friese

assigned to @v.friese

added 2 commits

• 51dc65a8 - Use templated function TDirectory::Get<T>
• 3f50acf9 - Fix macros

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Dear @wielanek_AT_if.pw.edu.pl, @i.selyuzhenkov, @a_meye37_AT_uni-muenster.de, @c.pauly, @v.singhal, @a.bercuci, @p.kaehler, @f.uhlig, @v.friese, @p.-a.loizeau, @c.muentz, @m.deveaux, @se.gorbunov, @v.akishina, @s.lebedev, @andrey.lebedev,

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added 20 commits

• 3f50acf9...5de9072a - 18 commits from branch computing:master
• 340239fc - Use templated function TDirectory::Get<T>
• 797b313d - Fix macros

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