Refactoring of the Dapp Registry (#4589)

* Add React Hot Loader to DappReg dapp

* Updated colours

* Add DappCards

* Dapp Modal with manifest displayed

* Add input to the Dapp Modal

* WIP // Editing a Dapp

* Clean-Up

* Linting

* CleanUp and separate dapp from dappS

* Semi-working updates

* Working Editing of a Dapp

* OCD

* Linting

* Add a Dapp -- WIP

* Register a new Dapp

* WIP Dapps

* Working update / delete / register

* Better promises

* Working updates for DappReg

* Fully functional again !

* Generic Card Component

* Dashed Register Card

* Cleanups

* Cleanups

* Add Actions to Modal

* Clean-Up

* Better Close Icon

* Single place for Registry version // Fetch meta-data from Registry

* Fixing test

* Fix saving changes in dapp reg

* PR Grumbles - Part I

* PR Grumble - Part I

* PR Grumble - Part II

* DappReg Contract owner can delete dapps

js/src/util/wallets.js

@@ -170,6 +170,10 @@ export default class WalletsUtils {
    * to make unnecessary calls on non-wallet accounts
    */
   static isWallet (api, address) {
+    if (!address) {
+      return Promise.resolve(false);
+    }
+
     if (!_cachedWalletLookup[address]) {
       const walletContract = new Contract(api, WalletAbi);