Fix no result displayed in CSV Importer

1. install server 8.10
2. install nuxeo-csv-1.5.4
3. import a CSV file (see attached):
   • click Add (see afterAdd810.png), note that Done is note displayed like in 7.10
   • click Process (see AfterClickingProcess810.png), there is no result it shows the same screen than at the beginning
4. refresh the folder -> the documents have been correctly imported
5. there is no error in the logs

See afterAdd710.png and importResultOk710.png correct behavior. (nuxeo-csv-1.4.4)

Import file attached for faster reproduction.