Fix a problem in TF1::GradientPar. The previous logic was wrong in case of an interpreted function.
Fix a problem in TF1::GradientPar.
The previous logic was wrong in case of an interpreted function.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@14407 27541ba8-7e3a-0410-8455-c3a389f83636

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