Fix NPE

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-1270@1727375 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/connectors/opennlp/connector/src/main/java/org/apache/manifoldcf/agents/transformation/opennlp/OpenNlpExtractor.java b/connectors/opennlp/connector/src/main/java/org/apache/manifoldcf/agents/transformation/opennlp/OpenNlpExtractor.java
index ff5e2dd..fc02dc6 100644
--- a/connectors/opennlp/connector/src/main/java/org/apache/manifoldcf/agents/transformation/opennlp/OpenNlpExtractor.java
+++ b/connectors/opennlp/connector/src/main/java/org/apache/manifoldcf/agents/transformation/opennlp/OpenNlpExtractor.java
@@ -284,7 +284,7 @@
   public boolean checkMimeTypeIndexable(VersionContext pipelineDescription, String mimeType, IOutputCheckActivity checkActivity)
     throws ManifoldCFException, ServiceInterruption
   {
-    if (!acceptableMimeTypes.contains(mimeType.toLowerCase(Locale.ROOT))) {
+    if (mimeType == null || !acceptableMimeTypes.contains(mimeType.toLowerCase(Locale.ROOT))) {
       return false;
     }
     // Do a downstream check too