Cell starting with a space in ods file is not parsed correctly

This file gives wrong results :
https://github.com/jonadem/messytables/commit/f7c3d84068eadbd91396810f256dead90906ea99

It seems that the tag `<text:s text:c="3"/>` is not supported.
For reference :
https://stackoverflow.com/questions/16561460/what-texts-means