Convert decimals to string in getSymbolAndDecimals; return null for symbol or decimals.

ui/app/components/pages/add-token.js

@@ -192,7 +192,7 @@ AddTokenScreen.prototype.attemptToAutoFillTokenParams = async function (address)
   if (symbol && decimals) {
     this.setState({
       customSymbol: symbol,
-      customDecimals: decimals.toString(),
+      customDecimals: decimals,
       autoFilled: true,
     })
   }

ui/app/components/pending-tx/index.js

@@ -94,23 +94,13 @@ PendingTx.prototype.setTokenData = async function () {
   if (isTokenTransaction) {
     const { symbol, decimals } = await getSymbolAndDecimals(txParams.to, existingTokens)
 
-    if (symbol && decimals) {
-      this.setState({
-        transactionType: TX_TYPES.SEND_TOKEN,
-        tokenAddress: txParams.to,
-        tokenSymbol: symbol,
-        tokenDecimals: decimals,
-        isFetching: false,
-      })
-    } else {
-      this.setState({
-        transactionType: TX_TYPES.SEND_TOKEN,
-        tokenAddress: txParams.to,
-        tokenSymbol: null,
-        tokenDecimals: null,
-        isFetching: false,
-      })
-    }
+    this.setState({
+      transactionType: TX_TYPES.SEND_TOKEN,
+      tokenAddress: txParams.to,
+      tokenSymbol: symbol,
+      tokenDecimals: decimals,
+      isFetching: false,
+    })
   } else {
     this.setState({
       transactionType: TX_TYPES.SEND_ETHER,

ui/app/token-util.js

@@ -38,8 +38,8 @@ async function getSymbolAndDecimals (tokenAddress, existingTokens = []) {
   const [ symbol = [], decimals = [] ] = result
 
   return {
-    symbol: symbol[0],
-    decimals: decimals[0],
+    symbol: symbol[0] || null,
+    decimals: decimals[0] && decimals[0].toString() || null,
   }
 }