Fix fabric-network dependency to 1.4.7 (#4)

1.4.6 version of fabric-ca-client was bad.

Signed-off-by: Mark S. Lewis <mark_lewis@uk.ibm.com>

Author: bestbeforetoday

README.md

@@ -7,14 +7,18 @@ used with the Hyperledger Fabric version 2.0 SDK for Node.
 import { WalletStores } from "fabric-wallet-migration";
 import { Wallet, Wallets } from "fabric-network";
 
-const walletStore = WalletStores.newFileSystemWalletStore(oldWalletDirectory);
-const oldWallet = new Wallet(walletStore);
+async function migrateWallet(oldWalletDirectory: string, newWalletDirectory: string) {
+    const walletStore = WalletStores.newFileSystemWalletStore(oldWalletDirectory);
+    const oldWallet = new Wallet(walletStore);
 
-const newWallet = await Wallets.newFileSystemWallet(newWalletDirectory);
+    const newWallet = await Wallets.newFileSystemWallet(newWalletDirectory);
 
-const identityLabels = await oldWallet.list();
-for (const label of identityLabels) {
-    const identity = await oldWallet.get(label);
-    await newWallet.put(label, identity);
+    const identityLabels = await oldWallet.list();
+    for (const label of identityLabels) {
+        const identity = await oldWallet.get(label);
+        if (identity) {
+            await newWallet.put(label, identity);
+        }
+    }
 }
 ```