From 3c97c0dbcfd259ae7730971b8f39d1043873c29a Mon Sep 17 00:00:00 2001
From: nyanpasu64 <nyanpasu64@tuta.io>
Date: Fri, 24 Aug 2018 01:03:17 -0700
Subject: [PATCH] Raise error when constructing Ovgen with 0 channels

---
 ovgenpy/ovgenpy.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ovgenpy/ovgenpy.py b/ovgenpy/ovgenpy.py
index 8285287..fe93fa1 100644
--- a/ovgenpy/ovgenpy.py
+++ b/ovgenpy/ovgenpy.py
@@ -97,6 +97,9 @@ class Ovgen:
         self.cfg = cfg
         self.has_played = False
 
+        if len(self.cfg.channels) == 0:
+            raise ValueError('Config.channels is empty')
+
     waves: List[Wave]
     channels: List[Channel]
     outputs: List[outputs.Output]