Empty output files created when input path contains spaces

[andrewphilipsmith]

How to reproduce

Try these command line options:

./src/alto2txt/extract_publications_text.py -p single "~/example path with spaces/input data/0002647" "~/example path with spaces/output files"

Actual output:

• The output directory structure is created correctly
• The files <source>_<year><date>_art<xxxx>_metadata.xml are create and populated (presumably correctly)
• The files <source>_<year><date>_art<xxxx>.txt are created, but contain only a single newline char and no other text

Expected output:

The output *.txt files should contain the relevant article text.