ReadMasterMoleculeList error handling of empty molecule lists

[AlistairBoettiger]

If the target molecule list happens to be empty (size 1 byte) for some reason because the file was never fully written or otherwise corrupt, ReadMasterMoleculeList attempts to initialize an array with an impossible number of molecules / fields which will result in a computer crash:

 Version para
 Contains 1702126957 field
 Status: 1702126957
 Number of molecules in Frame 0: 543450483
 Compact Representation: 1

It would be better to return an error that the file is corrupt, the anticipated number of molecules does not match the file size, or something like that.