loops with no embedded module/pipe should still parse

[ggaughan]

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e.g. 7f08cdb62621f878c6eca74154e502ff currently fails to parse

The if module['type'] == 'loop' test in _parse_pipe should then check for module['conf']['embed'] == None, and then ensure the loop can emit/assign its input stream. Probably best to create a pipe_identity operator that simply returns whatever it is passed and embed that as a default module.

[reubano]

I just made a bunch of updates, can you check and see if the issue is still there?