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Allow one file argument to csvjoin. File is passed through

Merged Administrator requested to merge github/fork/kundor/master into master

Created by: kundor

This is to fix issue #998 (closed).

The help text for csvjoin states

positional arguments:
  FILE                  The CSV files to operate on. If only one is specified,
                        it will be copied to STDOUT.

Currently, that's not true; instead csvjoin gives an error when called with only one argument.

Just eliminating the check lets it work, and single files are passed through fine. All tests still pass (I ran python3 -m unittest and discovery found 255 tests.)