fix(CLI): resolve generator issues

* exclude dataflow API - it doesn't have a single method as long as
  it's in B4. See https://github.com/Byron/google-apis-rs/issues/78
* assure ARRAY branch can be hit

Fixes #77

etc/api/shared.yaml

@@ -2,7 +2,8 @@ api:
   blacklist:
     # exclude APIs which currently don't build correctly. State the reason for the exclusion as well
     # to allow looking at it at a later point.
-    - 
+    # in beta, there is not a single method !
+    - dataflow
   terms:
     # how to actually do something with the API
     action: doit