Fix no-entries detection caused by Windows newlines

Merged Marius Shekow requested to merge 16-no-entries-detected into main

Closes #16 (closed)

Underlying problem: Windows CSV files may have \r\n as newline delimiter, and JS only split by \n. If the date column is the last one, the date was something like 2022-02-02\r which is invalid.

Fixed by stripping newlines and spaces for each line.

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