[#63120498] [#62809724] [#63928550] [#62820502]

[#62809724] Type Error issue in author_cocitations is handled. For
future data validations of input data one more story is created.
[#63120498] Typer Error created because of the Map function is handled.
[#63928550] changes done to handle this error.
[#62820502] comments in PT would give a better idea.