core: [common/utils] fix response error handling.

[otolab]

Fixes #918

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[stephenplusplus]

Thanks for sending this @otolab, and sorry for just merging my own PR and closing this one. It's only because it was a critical fix that I thought I should just take it on myself to make sure the fix got out as quickly as possible. Don't be discouraged to come back and contribute! I'll be more collaborative next time :)

Thanks again!

[otolab]

@stephenplusplus
I understand. :)
Thank you for the quick response.

I will sign the CLA by the next time. (^^;