Too vague warning on failure to load well names

[yngve-sk]

From the Everest course, user ran a case and got this warning from this part of everest_to_ert:

    try:
        data_wells = list(_load_all_wells(data_files))
    except Exception:
        warn_msg = (
            "Failed to load well names from {}. "
            "Only well data for wells specified in config file will be "
            "internalized during run."

The warning:

IOConfig: Reading GRIDFILE keyword from GRID section: Output of GRID file is not supported. Supported format: EGRID
WARNING:everest:Failed to load group names from ['/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA']. No group summary data will be internalized during run.
IOConfig: Reading GRIDFILE keyword from GRID section: Output of GRID file is not supported. Supported format: EGRID
WARNING:everest:Failed to load well names from ['/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA', '/project/everest/users/xxxx/day_3_wellrate/eclipse/model/REEK.DATA']. Only well data for wells specified in config file will be internalized during run.

The actual error:

As a minimum we should at least forward the caught exception message+traceback.