JAL-2629 fix hmmbuild validation failing if no AlignFrames present

diff --git a/src/jalview/gui/Preferences.java b/src/jalview/gui/Preferences.java
index 7c0ac95..ed86eab 100755 (executable)
--- a/src/jalview/gui/Preferences.java
+++ b/src/jalview/gui/Preferences.java
@@ -697,12 +697,14 @@ public class Preferences extends GPreferences
             Boolean.toString(hmmerFunctioning));
     AlignFrame[] frames = Desktop.getAlignFrames();
     boolean hmmerStatus = hmmerFunctioning && hmmerInstalled ? true : false;
-    for (AlignFrame frame : frames)
+    if (frames != null && frames.length > 0)
     {
-      frame.updateHMMERStatus(hmmerStatus);
+      for (AlignFrame frame : frames)
+      {
+        frame.updateHMMERStatus(hmmerStatus);
+      }
     }
     
-    
     trimTermini.setSelected(Cache.getDefault("TRIM_TERMINI", false));
     if (Cache.getDefault("USE_UNIPROT", false))
     {