XAS KeyError: 'spacegroup_number'

[superstar54]

In the AiiDAlab QE XAS calculaiton, I got this error:

/opt/conda/lib/python3.9/site-packages/aiida_quantumespresso/workflows/xspectra/crystal.py in validate_inputs(inputs, _)
    443 
    444         if 'symmetry_data' in inputs:
--> 445             spacegroup_number = inputs['symmetry_data']['spacegroup_number'].value
    446             equivalent_sites_data = inputs['symmetry_data']['equivalent_sites_data'].get_dict()
    447             if spacegroup_number <= 0 or spacegroup_number >= 231:

KeyError: 'spacegroup_number'

The reason is that in the AiiDAlab QE workflow, it assigns the XAS builder to the main app builder by:

setattr(builder, name, xas_plugin_builder)

in the xas_plugin_builder, the namespace symmetry_data could be empty, result in the error.

I think this is a common error source that the plugin's logic depend on whether a input exist or not, but not check if it is empty.