Disabling build failed when source directory is not found

If you add configuration

\<configuration\>
\<sourceDirFailed\>false\</sourceDirFailed\>
\</configuration\>

build no failed if source directory does not exist. Only log is print.

[INFO] -------------------------------------------------------
[INFO] P E R F O R M A N C E T E S T S
[INFO] -------------------------------------------------------
[INFO]

[INFO] Property source directory '/home/user/project/src/test/jmeter' does not exist!
[INFO]

[INFO]

[INFO] Test Results:
[INFO]

[INFO] Tests Run: 0, Failures: 0
[INFO]

Thanks to integrate this pull request.