Allow the use of WorkflowService without a callback?

[kinow]

In #149 when using the WorkflowService, I had to create a callback, even though I had no need of one for the Dashboard.vue. Would it be possible to use the service without one?

[kinow]

Passing an empty [] for the callbacks works. So since there's a workaround, let's close this one.

this.views
      .filter(v => v.activeCallback)
      .forEach(view => {
...

(Not sure if the filter statement was there from the beginning and I didn't notice it, or if it was added later, but not important now 😬 )