hg: kulla/dev/langtools: Fix NPE on XXX.<tab>

[robert.field at oracle.com]

Changeset: e0d8faf96659
Author:    rfield
Date:      2015-04-10 15:06 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/e0d8faf96659

Fix NPE on XXX.<tab>

! repl/src/impl/SourceCodeAnalysisImpl.java
! repl/src/impl/TaskFactory.java
! repl/src/tool/Repl.java
! src/java.compiler/share/classes/javax/lang/model/SourceVersion.java