Consumer Flow Creating Issues

- [ ] TD is not accepted if the action does not have an input. Pasting http://plugfest.thingweb.io:8083/testthing gives ` tdAction.input is undefined`. First, we should be more flexible since not all actions have an input. Second, the error should be pointing to the action if we want to show the error.
- [ ] Same for properties. I get DATATYPES[tdProperty.type] is undefined when there is no type. This has no type: http://plugfest.thingweb.io:8083/counter for countAsImage
- [ ] It would be better to add an `invoke` button to actions and a message saying "action invoked". Enter gives feedback if the action works as intended but if the action does not work, I cannot be sure if I managed to invoke it in the first place. Something similar would be good for properties and events as well, i.e. "property X read" etc.
- [ ] Not sure if this is from the plugin or from flowfuse, but when I have two UIs deployed, pressing on "Open Dashboard" on the second thing's flow brings me to the first thing's UI.

Otherwise, it works