From: Mateusz Warowny <mmzwarowny@dundee.ac.uk>
Date: Thu, 30 Sep 2021 15:07:00 +0000 (+0200)
Subject: JAL-3878 Fix null pointer exception when preparing empty sequences for job.
X-Git-Url: http://source.jalview.org/gitweb/?a=commitdiff_plain;h=3f1b59e8a014d6c4b7a1318b9d0080dd5c893e93;p=jalview.git

JAL-3878 Fix null pointer exception when preparing empty sequences for job.
---

diff --git a/src/jalview/ws2/operations/AlignmentOperation.java b/src/jalview/ws2/operations/AlignmentOperation.java
index 14564d6..530ea24 100644
--- a/src/jalview/ws2/operations/AlignmentOperation.java
+++ b/src/jalview/ws2/operations/AlignmentOperation.java
@@ -789,8 +789,8 @@ public class AlignmentOperation implements Operation
         }
         else
         {
-          String seqString = null;
-          if (seq.getEnd() >= seq.getStart()) // is it ever false?
+          String seqString = "";
+          if (seq.getEnd() >= seq.getStart())  // true if gaps only
           {
             seqString = seq.getSequenceAsString();
             if (!submitGaps)