Feature request: Differentiate between NOERROR and SERVFAIL

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### Prerequisites

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- [X] I am running the latest version
- [X] I checked to make sure that this issue has not already been filed

### Problem Description
It appears that NOERROR and SERVFAIL responses are treated the same way in the Query Log, namely just a white bar. Blocked queries are colored pink, so you can easily see those, but when something doesn't work on the network and everything is white ... you have to check each entry manually to see if an IP was actually resolved.

### Proposed Solution
Colour failed queries in another colour to make them stand out.