fix(channels): only adding channels into the service when there are to fix #23

[IsmaelMartinez]

Motivation

Only writing the channels in the service if there are any.

Also, only creating the detail-type badge if there is any detail-type

This fixes #23

[changeset-bot]

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Latest commit: daa22ae

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[IsmaelMartinez]

happy to create the changelog once I get a thumbs up on this. Thanks again for eventcatalog and for this generator.