Hi! I am trying to use the `Count` Combine transform on Fixed windows and get the following error:
``` java.lang.IllegalStateException: Default values are not supported in Combine.globally() if the output PCollection is not windowed by GlobalWindows. Instead, use Combine.globally().withoutDefaults() to output an empty PCollection if the input PCollection is empty, or Combine.globally().asSingletonView() to get the default output of the CombineFn if the input PCollection is empty. ``` I get that you need to set this on combiners for non-global windows but it is not possible to set for the `Count.globally()` transform. I can implement this using my own CompbineFn or `Sum` transform instead of course but still thought it was a bit strange. Is this a bug or why is this happening? Regards, Vilhelm von Ehrenheim
