Safely check the global appName and handle its inexistence

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

src/components/AppContent/AppContent.vue

@@ -120,6 +120,16 @@ import isMobile from '../../mixins/isMobile'
 
 const browserStorage = getBuilder('nextcloud').persist().build()
 
+let hasGlobalAppName = true
+let globalAppName
+try {
+ // This will throw a ReferenceError when the global variable is missing
+ // In that case we have to make the pane config key required
+ globalAppName = appName
+} catch (e) {
+ hasGlobalAppName = false
+}
+
 /**
  * App content container to be used for the main content of your app
  *
@@ -176,7 +186,8 @@ export default {
  */
  paneConfigKey: {
  type: String,
- default: appName,
+ default: globalAppName,
+ required: !hasGlobalAppName,
  },
 
  /**