fix 'No module named eidreader' during inv bd
fix 'No module named eidreader' during inv bd

lino-framework/book,lsaffre/lino_book,khchine5/book,lino-framework/book,khchine5/book,lsaffre/lino_book,lino-framework/book,lino-framework/book,khchine5/book,lsaffre/lino_book