Improve logging in bctest.py if there is a formatting mismatch #9945
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#9032 added format comparison checking to bctest.py.
If the formats don't match, the test doesn't print the difference between the expected output and the actual output, which makes troubleshooting and fixing the test difficult.
This small changes the logic so that if the formatting comparison fails, we go on to compare the data, and then fail the test if either of those comparisons fail.