protect GetCovarianceMatrixElement when the fit failed and the covariance matrix is not available
protect GetCovarianceMatrixElement when the fit failed and the covariance matrix is not available


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@32084 27541ba8-7e3a-0410-8455-c3a389f83636

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