hg: jdk/client: 8196133: JShell crashes when attempting to use bad source file in class path

[robert.field at oracle.com]

Changeset: 6dc5e0cdb44c
Author:    rfield
Date:      2018-02-16 16:18 -0800
URL:       http://hg.openjdk.java.net/jdk/client/rev/6dc5e0cdb44c

8196133: JShell crashes when attempting to use bad source file in class path
Reviewed-by: jlahoda

! src/jdk.jshell/share/classes/jdk/jshell/TaskFactory.java
! test/langtools/jdk/jshell/ToolBasicTest.java