npgsql - Npgsql2: Fixed possible datareader leak if the test fail.

Log Message:
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Fixed possible datareader leak if the test fail. The datareader wouldn't be closed until it was collected.

Modified Files:
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Npgsql2/testsuite/noninteractive/NUnit20:
CommandTests.cs (r1.49 -> r1.50)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/testsuite/noninteractive/NUnit20/CommandTests.cs?r1=1.49&r2=1.50)