Excelparser does not write catalog file correctly

[francescalb]

Tried by importing https://emmo-repo.github.io/versions/1.0.0-beta4/emmo-inferred.ttl in the excel file.
The resulting ontology refers to the correct EMMO-classes (so loading import works fine), but then it is not functioning when opening the resulting ontology in proege due to missing parts in the catalog file.

[francescalb]

The problem was not in writing, but that leading and trailing spaces (that are easily inserted by mistake in the excelfile) are written out in the catalog.