#751 fix - Replaces decimals from backend with decimals from blockchain (#755)

* Replaces decimals from backend with decimals from blockchain

* Removes fetching again token info from blockchain
Fixs decimals cast, now we force to move from bignumber to number
For data already wrong stored as string we remove it to force fetching again the decimals

* Fixs missing symbol

* Add description comment

src/logic/tokens/store/actions/fetchTokens.js

@@ -128,7 +128,7 @@ export const getTokenInfos = async (tokenAddress: string) => {
     address: tokenAddress,
     name: name ? name : tokenSymbol,
     symbol: tokenSymbol,
-    decimals: tokenDecimals,
+    decimals: tokenDecimals.toNumber(),
     logoUri: '',
   })
   const newTokens = tokens.set(tokenAddress, savedToken)

src/logic/tokens/store/actions/loadActiveTokens.js

@@ -11,8 +11,11 @@ import { type GlobalState } from '~/store/index'
 const loadActiveTokens = () => async (dispatch: ReduxDispatch<GlobalState>) => {
   try {
     const tokens: Map<string, TokenProps> = await getActiveTokens()
+    // The filter of strings was made because of the issue #751. Please see: https://github.com/gnosis/safe-react/pull/755#issuecomment-612969340
     const tokenRecordsList: List<Token> = List(
-      Object.values(tokens).map((token: TokenProps): Token => makeToken(token)),
+      Object.values(tokens)
+        .filter((t) => typeof t.decimals !== 'string')
+        .map((token: TokenProps): Token => makeToken(token)),
     )
 
     dispatch(saveTokens(tokenRecordsList))