Fix incorrect map key reference.
Fix incorrect map key reference.

Was causing:

Caught: java.lang.NullPointerException: Cannot invoke method plus() on null object
    at generate_junit_output$_run_closure1.doCall(generate_junit_output.groovy:22)
    at generate_junit_output.run(generate_junit_output.groovy:10)

mifos/bi,mifos/bi,mifos/bi