hg: jigsaw/jake/langtools: Avoiding RunCodingRules crash if the build directory is not available.

[jan . lahoda]

Changeset: 2f2d9ba7adc3
Author:    jlahoda
Date:      2016-04-29 13:13 +0200
URL:       http://hg.openjdk.java.net/jigsaw/jake/langtools/rev/2f2d9ba7adc3

Avoiding RunCodingRules crash if the build directory is not available.

! test/tools/all/RunCodingRules.java