4byte fallback (#6551)

* Adds 4byte registry fallback to getMethodData() (#6435)

* Adds fetchWithCache to guard against unnecessary API calls

* Add custom fetch wrapper with abort on timeout

* Use opts and cacheRefreshTime in fetch-with-cache util

* Use custom fetch wrapper with timeout for fetch-with-cache

* Improve contract method data fetching (#6623)

* Remove async call from getTransactionActionKey()

* Stop blocking confirm screen rendering on method data loading, and base screen route on transactionCategory

* Remove use of withMethodData, fix use of knownMethodData, in relation to transaction-list-item.component

* Load data contract method data progressively, making it non-blocking; requires simplifying conf-tx-base lifecycle logic.

* Allow editing of gas price while loading on the confirm screen.

* Fix transactionAction component and its unit tests.

* Fix confirm transaction components for cases of route transitions within metamask.

* Only call toString on id if truthy in getNavigateTxData()

* Fix knownMethodData retrieval and data fetching from fourbyte

1 files changed, 4 insertions, 0 deletions

diff --git a/ui/app/selectors/custom-gas.js b/ui/app/selectors/custom-gas.js
index 5ba786f0f..1f7ee8f9f 100644
--- a/ui/app/selectors/custom-gas.js
+++ b/ui/app/selectors/custom-gas.js
@@ -119,6 +119,10 @@ function isCustomPriceSafe (state) {
     return true
   }
 
+  if (safeLow === null) {
+    return null
+  }
+
   const customPriceSafe = conversionGreaterThan(
     {
       value: customGasPrice,