Pass enviroment to runtime config only when defined

Author: maraf

src/Components/Web.JS/src/Platform/Mono/MonoPlatform.ts

@@ -138,9 +138,12 @@ function prepareRuntimeConfig(options: Partial<WebAssemblyStartOptions>, onConfi
   const config: MonoConfig = {
     maxParallelDownloads: 1000000, // disable throttling parallel downloads
     enableDownloadRetry: false, // disable retry downloads
-    applicationEnvironment: options.environment,
   };
 
+  if (options.environment) {
+    config.applicationEnvironment = options.environment;
+  }
+
   const onConfigLoaded = async (loadedConfig: MonoConfig) => {
     if (!loadedConfig.environmentVariables) {
       loadedConfig.environmentVariables = {};