Add condition check before installing apps lists
Looks like `sudo yunohost app fetchlist -n name -u https://...` now returns an error when there's already an apps list named `name`. This cause the install script to fail when trying to add a list named `labriqueinternet` on a Cube that already has one. I'm not sure if this behavior is new to Yunohost 2.6, but I started noticing the problem since 2.6. This quick fix attempts to determine if a list named `name` already exists by grepping on `name:` in the output of `listlists`. This is not robust since it does rely on the output format of the command which might change.
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