bug/run damages with shapefile without providing file_ID

[MatthiasHauthDeltares]

Ra2ce version checks

• I have checked that this issue has not already been reported.
• I have checked that this bug exists on the latest version of Ra2ce in master here.

Reproducible example

network_section = NetworkSection(
    network_type=NetworkTypeEnum.DRIVE,
    source=SourceEnum.SHAPEFILE,
    primary_file=network_path.joinpath("network.shp"),
    # file_id="ID",
    save_gpkg=True,
    reuse_network_output=True,
    road_types=[
        RoadTypeEnum.SECONDARY,
        RoadTypeEnum.SECONDARY_LINK,
        RoadTypeEnum.PRIMARY,
        RoadTypeEnum.PRIMARY_LINK,
        RoadTypeEnum.TRUNK,
        RoadTypeEnum.MOTORWAY,
        RoadTypeEnum.MOTORWAY_LINK,
    ],
)

Current behaviour

file_ID is by default an empty string '', which breaks things further down the line because the graph (and gdf) now contains an empty attribute with an empty string '' as name.

File "C:\Users\hauth\repositories\ra2ce\ra2ce\analysis\damages\damages.py", line 241, in
if (col[0].isupper() and col[1] == "_")
~~~^^^
IndexError: string index out of range

Desired behaviour

if file_id = '', dont add the attribute to the graph/gdfs

Additional context

No response