Select all transform nodes that have no shape nodes under them

py_findEmptyGroups_v001_01.py

# Find Empty Groups V001_01
# Select all transform nodes that have no shape nodes under them

if not 'pm' in dir():
    import pymel.core as pm
    print ('imported pymel')
else:
    print('pymel exists')


def getEmptyTransforms(sel=[]):
    returnList = []
    if not sel:
        sel = pm.ls(type='transform')
    print(f'sel is {sel}')
    for thisXform in sel:
        if not (pm.listRelatives(thisXform, ad=True, type='shape')):
            returnList.append(thisXform)
    print(f'{len(returnList)} empty transforms found')
    print(f'{returnList}')
    return returnList

emptyXforms = getEmptyTransforms(pm.ls(sl=True))
pm.select(emptyXforms, replace=True)