Empty FHI-aims band structures
The search finds several FHI-aims calculations with an electronic band structure. It seems, however, that some of the section_k_bands
are empty. One example can be found here: https://nomad-lab.eu/prod/rae/beta/gui/entry/id/Xlj4REb1SKu3vW1_0Su4aA/La97QkYQg7M8ODN0O-KoH3Vmw6rv/archive/section_run/section_single_configuration_calculation/section_k_band
If band structures are not present, then the parser should not open this section. If a band structure can be parsed, then the section should be populated with all the necessary metainfo (segments, energies, k-points).