Job register service impl further cleanup

For your kind consideration, two additional commits (a. https://github.com/vorburger/mifosx/commit/f194867c1571cd7c48b9c648119ce71d4965d2a4 & b. https://github.com/vorburger/mifosx/commit/37710750eba5638332eb2a635eff1b1db11e7b17), which are much more minor than the rest, but which made the code clearer at least to me while digging into all this.