[Rivet] #213: Rivetgun should report an error if a specified parameter file is missing.

[jmb at hep.ucl.ac.uk]

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Prof. Jonathan Butterworth,              http://www.hep.ucl.ac.uk/~jmb/ 

Physics and Astronomy Department                  Tel: +44 20 7679 3444
University College London                 Gower St, London WC1E 6BT, UK
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