fix: default to null when query address is undefined (#5937)

src/graphql/data/Token.ts

@@ -14,7 +14,7 @@ The difference between Token and TokenProject:
     TokenProjectMarket is aggregated market data (aggregated over multiple dexes and centralized exchanges) that we get from coingecko.
 */
 gql`
-  query Token($chain: Chain!, $address: String) {
+  query Token($chain: Chain!, $address: String = null) {
     token(chain: $chain, address: $address) {
       id
       decimals

src/graphql/data/TokenPrice.ts

 import gql from 'graphql-tag'
 
 gql`
-  query TokenPrice($chain: Chain!, $address: String, $duration: HistoryDuration!) {
+  query TokenPrice($chain: Chain!, $address: String = null, $duration: HistoryDuration!) {
     token(chain: $chain, address: $address) {
       id
       address

src/graphql/data/__generated__/types-and-hooks.ts

@@ -1018,7 +1018,7 @@ export type NftRouteQuery = { __typename?: 'Query', nftRoute?: { __typename?: 'N
 
 
 export const TokenDocument = gql`
-    query Token($chain: Chain!, $address: String) {
+    query Token($chain: Chain!, $address: String = null) {
   token(chain: $chain, address: $address) {
     id
     decimals
@@ -1097,7 +1097,7 @@ export type TokenQueryHookResult = ReturnType<typeof useTokenQuery>;
 export type TokenLazyQueryHookResult = ReturnType<typeof useTokenLazyQuery>;
 export type TokenQueryResult = Apollo.QueryResult<TokenQuery, TokenQueryVariables>;
 export const TokenPriceDocument = gql`
-    query TokenPrice($chain: Chain!, $address: String, $duration: HistoryDuration!) {
+    query TokenPrice($chain: Chain!, $address: String = null, $duration: HistoryDuration!) {
   token(chain: $chain, address: $address) {
     id
     address

src/utils/nativeTokens.ts

@@ -2,7 +2,7 @@ import { nativeOnChain } from 'constants/tokens'
 import { Chain } from 'graphql/data/__generated__/types-and-hooks'
 import { CHAIN_NAME_TO_CHAIN_ID } from 'graphql/data/util'
 
-export function getNativeTokenDBAddress(chain: Chain): string {
+export function getNativeTokenDBAddress(chain: Chain): string | undefined {
   const pageChainId = CHAIN_NAME_TO_CHAIN_ID[chain]
   switch (chain) {
     case Chain.Celo:
@@ -12,6 +12,6 @@ export function getNativeTokenDBAddress(chain: Chain): string {
     case Chain.Arbitrum:
     case Chain.EthereumGoerli:
     case Chain.Optimism:
-      return 'ETH'
+      return undefined
   }
 }