From 56cdd4b9a88dad720c33ad97961cd0541f8bc468 Mon Sep 17 00:00:00 2001
From: jprocter <Jim Procter>
Date: Sun, 14 Nov 2010 14:55:20 +0000
Subject: [PATCH] zero length operations are valid

---
 src/jalview/datamodel/CigarBase.java |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/jalview/datamodel/CigarBase.java b/src/jalview/datamodel/CigarBase.java
index 2508717..d351603 100644
--- a/src/jalview/datamodel/CigarBase.java
+++ b/src/jalview/datamodel/CigarBase.java
@@ -268,10 +268,14 @@ public abstract class CigarBase
     {
       throw new Error("Implementation error. Invalid operation string.");
     }
-    if (range <= 0)
+    if (range==0)
+    {
+      return; // No Operation to add.
+    }
+    if (range < 0)
     {
       throw new Error(
-              "Invalid range string (must be non-zero positive number)");
+              "Invalid range string (must be zero or positive number)");
     }
     int lngth = 0;
     if (operation == null)
-- 
1.7.10.2