[Merge] lp:~thomas-voss/location-service/fix-1462664 into lp:location-service/15.04

[Alberto Mardegan]

But, how does this fixes the linked issues? The methods where already invoked asynchronously; this just adds error logging (which is good).
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https://code.launchpad.net/~thomas-voss/location-service/fix-1462664/+merge/275449
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