* change the directory's name for a download when the chapter's name is only composed of numbers or is blank * maj in case the chapter name is blank or empty * clean code (cherry picked from commit 41cc1fe7237a52c830e87c8261254b7f59922a6b)
* change the directory's name for a download when the chapter's name is only composed of numbers or is blank * maj in case the chapter name is blank or empty * clean code (cherry picked from commit 41cc1fe7237a52c830e87c8261254b7f59922a6b)