PyCSW ConfigParser.get has wrong number of arguments

In `ckan_pycsw.py` there is a `TypeError` raised when various references to `table_name = pycsw_config.get("repository", "table", "records")` is called, indicating a maximum of 3 arguments, with 4 supplied, e.g.

https://github.com/ckan/ckanext-spatial/blob/master/bin/ckan_pycsw.py#L27

According to https://docs.python.org/3/library/configparser.html#fallback-values there is a keyword-only `fallback` argument, which looks to be the possible intended behavior here? Should this be

Start in bin/ckan_pycsw.py at the table_name assignment and inspect how repository configuration is read through ConfigParser.get. Confirm the expected fallback behavior from Python's ConfigParser documentation, then exercise the ckan_pycsw entry point with the relevant configuration. Done means the command no longer raises the argument-count TypeError and resolves the table name as intended.

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