JDBC drivers: fix 'Unsupported URL' – drivers might be called witrh wrong URLs and then they should (according to the JavaDoc) return null instead of throwing an exception.
This problem occurred when --test-connection was testing multiple connections in parallel.
4 echo -n "Mercurial: "; hg identify || echo "n/a";
5 echo -n "Compiled: "; date --rfc-3339=seconds;
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