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bbfa235
(Get the code!)
No, there are two different use cases here:
1. Did apt-get update (potentially) change something?
2. Did apt-get update (potentially) change everything?
In the general case, 1 is what you need to know. For example, a tool that runs update and then upgrades your system: You don't want to prevent the system from being upgraded (in an update&&upgrade type scenario) just because some third party repository disappeared.
Then there is the question of fatal vs non-fatal errors. A DNS resolution error like here is most likely temporary, you don't want to fail update because of it, this would just confuse users (don't spam me twice a day with errors just because my machine is offline).