Allow for non-connected component-calls

[maschmann]

In rare cases, only a single component is called to do just one thing.
Currently the parser/dumper disallow that if using the FBP format.

Example:

{
  "properties": {
    "name": "Create an article from json data"
  },
  "processes": {
    "SidebarCreator": {
      "component": "SidebarCreator"
    }
  },
  "connections": []
}