Better:
def clean(d):
for key,val in d.items():
if isinstance(val, dict):
val = clean(val)
if val is None or val == {}:
del d[key]
return d
a = {1: {2: 2, 3: {1: None, 2: 2}}, 2: 2, 3: None}
print clean(a) # Out: {1: {2: 2, 3: {2: 2}}, 2: 2}
b = {1: {1: {1: None, 2: {1: None}}}, 2: 2, 3: None}
print clean(b) # Out: {2: 2}
c = {1: {1: {1: None, 2: {1: None}}}, 2: 2, 3: 0}
print clean(c) # Out: {2: 2, 3: 0}
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