lib/installation: Don't stop getting removable remotes if one attempt fails

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When listing the removable remotes, it will stop the operation after the
first configurable remote that has no collection ID set.
This is of course a problem as such an occurrence is not a reason for
not trying to list any remaining remotes.

This patch fixes that by simply reporting the failures as a debug
message instead of aborting.

Closes: #1587
Approved by: mwleeds

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