This is fixed, just posting for posterity.
If one wants to run pdb2gmx with -vsites hydrogens on gromacs 4.5.4 or
4.0.7 while using the oplss ff, there is the error message:
Fatal error:
Can't find dummy mass for type opls_242 bonded to type opls_238 in the
virtual site database (.vsd files). Add it to the database!
To fix this, one must then add the following line:
opls_242 opls_238 MCH3A
to the [ CH3 ] section of oplsaa.ff/aminoacids.vsd
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