JAL-3402 suppress unmapped chains in View Chain menu

diff --git a/src/jalview/gui/StructureViewerBase.java b/src/jalview/gui/StructureViewerBase.java
index 853ecc1..e7e2967 100644 (file)
--- a/src/jalview/gui/StructureViewerBase.java
+++ b/src/jalview/gui/StructureViewerBase.java
@@ -549,6 +549,10 @@ public abstract class StructureViewerBase extends GStructureViewer
     for (String chain : chainNames)
     {
       String seqName = getSequenceNameForChain(chain);
+      if (seqName == null)
+      {
+        continue;
+      }
       int nameLength = seqName.length();
       if (nameLength > 16)
       {