Handle null and undefined globalDisclaimer values.

Author: na9da

index.js

@@ -85,7 +85,7 @@ export default terria
       updateApplicationOnMessageFromParentWindow(terria, window);
 
       // Show a modal disclaimer before user can do anything else.
-      if (terria.configParameters.globalDisclaimer !== undefined) {
+      if (terria.configParameters.globalDisclaimer) {
         showGlobalDisclaimer(viewState);
       }
 

lib/Views/showGlobalDisclaimer.ts

@@ -9,8 +9,8 @@ export default function showGlobalDisclaimer(viewState: ViewState) {
   const globalDisclaimer = terria.configParameters.globalDisclaimer;
   const hostname = window.location.hostname;
   if (
-    globalDisclaimer.enableOnLocalhost ||
-    hostname.indexOf("localhost") === -1
+    globalDisclaimer &&
+    (globalDisclaimer.enableOnLocalhost || hostname.indexOf("localhost") === -1)
   ) {
     let message = "";
     // Sometimes we want to show a preamble if the user is viewing a site other than the official production instance.