AW: Hier-Block2: Infinite streams (in/out)

Hi!

If I forget to connect a port of an hierblock2, I will get a confusing
error
message:
RuntimeError: block is not a valid gr_block or gr_hier_block2!

It would be useful if you check this upon entering the flattening
process
for example and give a more useful message. The debug trace finally
pointed
me to my mistake. The error message didn’t help at all.

Dominik

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