chore: fix set-env script

Author: szuperaz

set-env.ts

@@ -19,13 +19,17 @@ const prodEnvConfig = {
 const envConfig: { [key: string]: any } =
   process.env.ANGULAR_ENV === 'production' ? prodEnvConfig : devEnvConfig;
 
+const tokenUrl = process.env.STREAM_TOKEN_URL
+  ? `'${process.env.STREAM_TOKEN_URL}'`
+  : `''`;
+
 // `environment.ts` file structure
 const envConfigFile = `export const environment = {
     ${Object.keys(envConfig).map((k) => `${k}: ${envConfig[k]},`)}
     apiKey: '${process.env.STREAM_API_KEY}',
     userId: '${process.env.STREAM_USER_ID}',
     userToken: '${process.env.STREAM_USER_TOKEN}',
-    tokenUrl: '${process.env.STREAM_TOKEN_URL}',
+    tokenUrl: ${tokenUrl},
     channelsFilter: ${process.env.STREAM_CHANNELS_FILTER}
   };
   // I am a generated file, do not modify me directly, see set-env script