Fix for a strange and extremely rare typo bug in the model-free specific analysis code.
This was identified by Manish Chaubey <manish dott chaubey att tuebingen dott mpg dott de> in the
message at http://thread.gmane.org/gmane.science.nmr.relax.user/1422.
This only occurs if a relaxation data error of zero is encountered and is a bug in the RelaxError
message explaining the problem with the data.
