Fix for bug #10528.  Hashtable does not support null value for key (unlike HashMap), so check for null key value before getting value.
Fix for bug #10528.  Hashtable does not support null value for key (unlike HashMap), so check for null key value before getting value.


git-svn-id: f8ec76806b93013cd47e945cc2def9ed48bbf7ea@309616 13f79535-47bb-0310-9956-ffa450edef68

smathieu/librarian_sample_repo_java,smathieu/librarian_sample_repo_java,qos-ch/reload4j,qos-ch/reload4j,qos-ch/reload4j