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Avoid using deprecated RooDataSet constructor #947

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guitargeek
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The RooDataSet constructor that takes a weight variable name was deprecated in ROOT 6.32:
root-project/root#14317

The general command argument constructor should be used, which doesn't change the functionality and is also backwards compatible with older ROOT versions.

Also, avoid a unused variable warning.

@anigamova
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Thanks @guitargeek! I guess with ROOT < 6.32 it is not going to work, right? Should we add if statements and use the new constructors with ROOT version starting with 6.32?

@guitargeek
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It will work with any Root version. It was confusing to users which constructor they should actually use, hence ROOT 6.32 deprecated several redundant constructors.

@anigamova
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ah, ok, from the documentation of the earlier version it is not that clear indeed, thanks!

The RooDataSet constructor that takes a weight variable name was
deprecated in ROOT 6.32:
root-project/root#14317

The general command argument constructor should be used, which doesn't
change the functionality and is also backwards compatible with older
ROOT versions.

Also, avoid a unused variable warning.
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