Minor improvements in dealing with empty floats #15
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Print out the row number that caused the error to aid debugging of the CSV file.
Test for empty string and if empty output value as float('nan')
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Dealing with a 69M row CSV that has a column that I've set as a float. Occasionally there are rows with empty values which was throwing a ValueError. This PR add debugging info as well as allowing these empty values to be replaced with a NAN instead.