BUG: Hot Fix smart contract nil field update replace existed value

[Naupio]

link issue #918

[coveralls]

Coverage increased (+0.03%) to 30.254% when pulling d8c3b46 on Naupio:fix_smart_contract_nil_field_update into fae6c6e on Magickbase:godwoken-v1-testnet-prod.

[Naupio]

if deployment tx hash not found in polyjuice table, trigger verify_and_update_from_sourcify api will use nil replace existed value in smart contract, its not expect behavior, solve it with filtering nil params when updating @Keith-CY @zmcNotafraid