Combining tck files that were generated with different settings, such as a mix of uni and bidirectional, results in the value for that parameter in the tck file being set to "variable" rather than a number. This PR stops the reader crashing in this scenario
Combining tck files that were generated with different settings, such as a mix of uni and bidirectional, results in the value for that parameter in the tck file being set to "variable" rather than a number. This PR stops the reader crashing in this scenario