refactor(webpack): account for null deep link config

Author: danbucholtz

src/webpack/ionic-environment-plugin.ts

@@ -83,8 +83,11 @@ export class IonicEnvironmentPlugin {
 
 export function convertDeepLinkConfigToWebpackFormat(parsedDeepLinkConfigs: HydratedDeepLinkConfigEntry[]) {
   const dictionary: { [index: string]: string} = { };
+  if (!parsedDeepLinkConfigs) {
+    parsedDeepLinkConfigs = [];
+  }
   parsedDeepLinkConfigs.forEach(parsedDeepLinkConfig => {
     dictionary[parsedDeepLinkConfig.modulePath] = parsedDeepLinkConfig.absolutePath;
   });
   return dictionary;
-}
+}