New data import: group data is not used

[Christoph27]

Import (in MoBi) from file "Test4.xlsx"

Test4.xlsx

Mapping as shown blow (especially group by -> location):

(Mapping Organ to column "location" gives the same result)

The default naming pattern is kept: {Source}.{Sheet}.{location}

After importing, the location is not used for naming the data sets (naming is e.g. "Test4.Organs._1")
Further, the location is missing at the meta data

[Christoph27]

similar for file "test_fractions_Tumor.xlsx" when mapping Subject ID to column PatientID
test_fractions_Tumor.xlsx

[georgeDaskalakis]

Cannot reproduce with develop. I think this should have been solved by PR #1384