fixed few crashes in domain_pastes.py #100
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fixed crash when error is encountered due to non-existent keys (unable to results from google when Custom Search API is not enabled), fixed if condition check in main(), printing correct error message from google response when getting an error.
If user has not enabled Custom Search API from Google Cloud Console, an error is thrown with the link to enable it. That message is printed to console so that user can enable it from there.