Simplify the algorithm in GraphFitChisquare in case the errors in x and y are null. In this case the error is estimated by taking the difference of the function at x+epsilon and x-epsilon 9with epsilon = x range/1000).
Simplify the algorithm in GraphFitChisquare in case the errors in x and y are null.
In this case the error is estimated by taking the difference of the function
at x+epsilon and x-epsilon 9with epsilon = x range/1000).


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@4889 27541ba8-7e3a-0410-8455-c3a389f83636

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