If I try and model a file where there are differing length records, I get an error, i.e.

No value found for column "EMPTY_VALUE" in the row ending on text line 1 in file...

Instead I would expect to see null values.

For example, if this is my file (CSV)

HEADER,KEEP,THESE,VALUES,NOT,COLUMN,NAMES
Data, more data, other data, 2, 3, 4, 5, more data, what else, more data, and, so, on

I can read the file in but trying to model it gives me the error mentioned above.