hg: jdk9/dev/langtools: 8178023: jshell tool: crash with ugly message on attempt to add non-existant module path

[robert.field at oracle.com]

Changeset: 256d9fce6c53
Author:    rfield
Date:      2017-04-11 17:26 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/langtools/rev/256d9fce6c53

8178023: jshell tool: crash with ugly message on attempt to add non-existant module path
Reviewed-by: jlahoda

! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java
! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/resources/l10n.properties
! src/jdk.jshell/share/classes/jdk/jshell/execution/FailOverExecutionControlProvider.java
! src/jdk.jshell/share/classes/jdk/jshell/execution/JdiInitiator.java
! test/jdk/jshell/DyingRemoteAgent.java
! test/jdk/jshell/HangingRemoteAgent.java
! test/jdk/jshell/HistoryTest.java
! test/jdk/jshell/JdiBadOptionLaunchExecutionControlTest.java
! test/jdk/jshell/JdiBadOptionListenExecutionControlTest.java
! test/jdk/jshell/JdiBogusHostListenExecutionControlTest.java
! test/jdk/jshell/ReplToolTesting.java
! test/jdk/jshell/StartOptionTest.java
! test/jdk/jshell/ToolProviderTest.java
! test/jdk/jshell/ToolReloadTest.java
! test/jdk/jshell/UITesting.java