avoid null pointer exception when no features visible

diff --git a/src/jalview/io/FeaturesFile.java b/src/jalview/io/FeaturesFile.java
index 17ff88f..2bc3b4b 100755 (executable)
--- a/src/jalview/io/FeaturesFile.java
+++ b/src/jalview/io/FeaturesFile.java
@@ -598,7 +598,7 @@ public class FeaturesFile extends AlignFile
         next = seqs[i].getSequenceFeatures();\r
         for (int j = 0; j < next.length; j++)\r
         {\r
-          if (visOnly && !visible.containsKey(next[j].type))\r
+          if (visOnly && visible!=null && !visible.containsKey(next[j].type))\r
           {\r
             continue;\r
           }\r