Bug when subject column contains a number

[petasis]

If a subject column is a number, an error is raised: pread2rdf/mapping/default_cell_mappings.rb:19:in uri_normalization': undefined methodgsub' for 5003270.0:Float (NoMethodError)

A check should be added to convert value into a string, if it is not a string.

[petasis]

I don't know ruby, but I modified default_cell_mapping.rb to:

def self.uri_normalization(string)
          if string.is_a? Numeric then
             string = string.to_i.to_s
          end
          string
            .gsub(' - ', '-')
            .gsub('- ', '-')
            .gsub(', ', '-')
            .gsub(' ', '_')
        end