Resolve null coalescing when entering bill and add Zoho.

client/public/index.html

@@ -8,11 +8,24 @@
     <meta name="description" content="Rome Online" />
     <!-- <link rel="apple-touch-icon" href="logo192.png" /> -->
     <link rel="apple-touch-icon" href="logo192.png" />
-    <script
+    <script type="text/javascript">
-      src="//fw-cdn.com/7044805/3245968.js"
+      var $zoho = $zoho || {};
-      chat="true"
+      $zoho.salesiq = $zoho.salesiq || {
-      widgetId="dac319bf-db92-44b6-85c5-77c73f3f8a5d"
+        widgetcode:
-    ></script>
+          "2ee4b2212fbdb380fb1e5e612f1e2dd7fe52032bee013140e27458e960add8e65b3cc65a44e7ecddabee40ced28dcfbd",
+        values: {},
+        ready: function () {},
+      };
+      var d = document;
+      s = d.createElement("script");
+      s.type = "text/javascript";
+      s.id = "zsiqscript";
+      s.defer = true;
+      s.src = "https://salesiq.zoho.com/widget";
+      t = d.getElementsByTagName("script")[0];
+      t.parentNode.insertBefore(s, t);
+      d.write("<div id='zsiqwidget'></div>");
+    </script>
 
     <script>
       !(function () {

client/src/components/bill-form/bill-form.totals.utility.js

@@ -19,14 +19,14 @@ export const CalculateBillTotal = (invoice) => {
       }).multiply(i.quantity || 1);
 
       subtotal = subtotal.add(itemTotal);
-      if (i.applicable_taxes.federal) {
+      if (i.applicable_taxes?.federal) {
         federalTax = federalTax.add(
           itemTotal.percentage(federal_tax_rate || 0)
         );
       }
-      if (i.applicable_taxes.state)
+      if (i.applicable_taxes?.state)
         stateTax = stateTax.add(itemTotal.percentage(state_tax_rate || 0));
-      if (i.applicable_taxes.local)
+      if (i.applicable_taxes?.local)
         localTax = localTax.add(itemTotal.percentage(local_tax_rate || 0));
     }
   });