Inverse equality in DeploymentInfo

[marcingrzejszczak]

In https://github.com/hpcloud/cloudfoundry-jenkins/blob/master/src/main/java/com/hpe/cloudfoundryjenkins/DeploymentInfo.java your checking for equality to "" like this:

 this.command = jenkinsConfig.command;
        if (command.equals("")) {
            command = null;
        }

You should inverse the check like this

 this.command = jenkinsConfig.command;
        if ("".equals(command)) {
            command = null;
        }

Cause otherwise you will cause NPEs (which I'm getting)

[marcingrzejszczak]

Also in other places you should consider that the XML doesn't contain for instance appURIs. If one is generating jobs from the code he is forced to set every single value. Maybe it would be nice to assume that XML entries can be null ?