[Commotion-admin] [commotion-dashboard-helper] Check for existing entry before adding to crontab (#19)

[gradyoti]

Totally works. Upgraded a 1.1 image with an image of this branch. 

No duplicates on either system.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19#issuecomment-37350281
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