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Describe the bug
When using the Combine_BEM() function with non-WAMIT input, Ainf is not initialized and throws an error.

Previously, for non-WAMIT input hydro.Ainf was initialized to the highest frequency added mass value in Normalize.m. This was removed when the new Ainf implementation as added in radiation_IRF.m. The Combine_BEM function now attempts to concatenate Ainf values that do not exist in non-WAMIT input.

WEC-Sim file(s)
Radiation_IRF.m, Combine_BEM.m, Normalize.m

To Reproduce
Steps to reproduce the behavior:

1. Go to examples/NEMOH/ellipsoid/bemio.m
2. Uncomment the lines combining NEMOH and WAMIT BEM output
3. Run bemio in the command line

Expected behavior
I expected bemio and Radiation_IRF to run without issue and generate an .h5 file.

Screenshots
If applicable, add screenshots to help explain your problem. For example, a screen shot of the exact error message from the MATLAB command line.

Workstation Information (this section MUST BE completed):

• OS: Windows 10
• MATLAB/Simulink Release 2020b
• WEC-Sim Release v4.2

Additional context
Suggested fix:
The Combine_BEM function should catch undefined Ainf values, or Normalize should initialize Ainf to 0 (this would be overwritten in Radiation_IRF).