JAL-2371 create a default ResidueShader when constructing the viewport

diff --git a/src/jalview/viewmodel/AlignmentViewport.java b/src/jalview/viewmodel/AlignmentViewport.java
index 1e31ebc..cdf0758 100644 (file)
--- a/src/jalview/viewmodel/AlignmentViewport.java
+++ b/src/jalview/viewmodel/AlignmentViewport.java
@@ -609,7 +609,7 @@ public abstract class AlignmentViewport implements AlignViewportI,
 
   protected boolean ignoreGapsInConsensusCalculation = false;
 
-  protected ResidueShaderI residueShading;
+  protected ResidueShaderI residueShading = new ResidueShader();
 
   @Override
   public void setGlobalColourScheme(ColourSchemeI cs)