When the type of gas to be created did not already exist, the reaction
caused a runtime and halted processing.
While tritium would still be consumed, no hydrogen would be created,
and no heat modification would occur.
This fixes runtimes of the form:
> [02:02:46] Runtime in reactions.dm,946: cannot read from list
> proc name: react (/datum/gas_reaction/proto_nitrate_tritium_response/react)
61114c2dc2