fix multiple usage output on invalid arguments

colcon / colcon-mixin

Extension for colcon to read CLI mixins from files

http://colcon.readthedocs.io

Apache License 2.0

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Closed dirk-thomas closed 5 years ago

dirk-thomas commented 5 years ago

Follow up of #7.

Leverage the new context manager from colcon/colcon-core#155 to gain the same fix and remove the duplicate logic.