FS-8306 #resolve if the exchange doesn't exist, then create it, else

fail. This resolves several error cases.

src/mod/event_handlers/mod_amqp/mod_amqp_command.c

@@ -151,10 +151,7 @@ switch_status_t mod_amqp_command_create(char *name, switch_xml_t cfg)
 		}
 	}
 	profile->conn_active = NULL;
-
-	if ( mod_amqp_connection_open(profile->conn_root, &(profile->conn_active), profile->name, profile->custom_attr) != SWITCH_STATUS_SUCCESS) {
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Profile[%s] was unable to connect to any connection\n", profile->name);
-	}
+	/* We are not going to open the command queue connection on create, but instead wait for the running thread to open it */
 	
 	/* Start the worker threads */
 	switch_threadattr_create(&thd_attr, profile->pool);
@@ -200,6 +197,19 @@ void * SWITCH_THREAD_FUNC mod_amqp_command_thread(switch_thread_t *thread, void
 				continue;
 			}
 
+			/* Check if exchange already exists */ 
+			amqp_exchange_declare(profile->conn_active->state, 1,
+								  amqp_cstring_bytes(profile->exchange),
+								  amqp_cstring_bytes("topic"),
+								  0, /* passive */
+								  1, /* durable */
+								  amqp_empty_table);
+
+			if (mod_amqp_log_if_amqp_error(amqp_get_rpc_reply(profile->conn_active->state), "Checking for command exchange")) {
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Profile[%s] failed to create missing command exchange", profile->name);
+				continue;
+			}
+
 			/* Ensure we have a queue */
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Creating command queue");
 			recv_queue = amqp_queue_declare(profile->conn_active->state, // state