fix: check process.argv length before determining app name

prevent a probloem like in abreits#20 and a fix similar to abreits/amqp-ts/#62

src/amqp-ts.ts

@@ -9,10 +9,14 @@
 
 import * as path from "path";
 
+/** Name of the current application determined by AMQP_APPLICATIONNAME env or the name of the dir we're running in. */
 export const ApplicationName =
-  process.env.AMQPTS_APPLICATIONNAME ||
-  (path.parse ? path.parse(process.argv[1]).name : path.basename(process.argv[1]));
-
+  process.env.AMQP_APPLICATIONNAME ||
+  (process.argv.length > 1
+    ? path.parse
+      ? path.parse(process.argv[1]).name
+      : path.basename(process.argv[1])
+    : "amqpApp");
 
 // name for the RabbitMQ direct reply-to queue
 export const DIRECT_REPLY_TO_QUEUE = "amq.rabbitmq.reply-to";