bootstrap.php: better logging if logException fails
bootstrap.php: better logging if logException fails

If the call to `logException` fails, we will continue to report the
cause of the failure with `error_log`, but now we will also report
the original exception that was thrown.

smrealms/smr,smrealms/smr,hemberger/smr,hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr