scenarios are not persisted correctly to/read from XLS template

[okworx]

Test case:

• create new EPD dataset

• choose EF3.1 profile

• create scenarios "100% incineration" and "100% recycling", leaving group empty, selecting the former as default
  

• add modules for both scenarios
  

• synchronize results table

• export results table to XLS template

• add some test numbers to XLS template:
  results_EF3.1_dual_scenario.xlsx

• create new EPD dataset

• import XLS template

Observed behavior:

• there are duplicate entries in the scenarios list
• the default status is not restored
  

Expected behavior:

• only two scenarios are in the scenarios list
• the default status is restored ("100% incineration" marked as default)
• bonus: the correct profile is being picked up and reflected in the profile drop-down

The same behavior can be observed when explicitly assigning a group ID. When adding another scenario group and using explicit group IDs, the group IDs and default status is lost as well (example XLS template: results_EF3.1_quad_scenario.xlsx)

In general, all declared scenarios without a group ID should be treated as belonging to the same group.