From 40f93ba6e0b7e8215d4f2942d30e34cc7cb688b9 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <carl@carlh.net>
Date: Mon, 22 Mar 2010 22:14:54 +0000
Subject: [PATCH] Add an assert and fix a crash on creating a new tape track.

git-svn-id: svn://localhost/ardour2/branches/3.0@6785 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/audio_diskstream.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/audio_diskstream.cc b/libs/ardour/audio_diskstream.cc
index 1f77964d0d..03f17c6e76 100644
--- a/libs/ardour/audio_diskstream.cc
+++ b/libs/ardour/audio_diskstream.cc
@@ -346,6 +346,8 @@ AudioDiskstream::setup_destructive_playlist ()
 
 	/* a single full-sized region */
 
+	assert (!srcs.empty ());
+
 	PropertyList plist;
 	plist.add (Properties::name, _name.val());
 	plist.add (Properties::start, 0);
@@ -1968,7 +1970,7 @@ AudioDiskstream::reset_write_sources (bool mark_write_complete, bool /*force*/)
 		}
 	}
 
-	if (destructive()) {
+	if (destructive() && !c->empty ()) {
 
 		/* we now have all our write sources set up, so create the
 		   playlist's single region.