public NT getNonTerminal(String name) {
		return nonterminals.get(name);
	}
Get the named non-terminal

@param name the name of the desired non-terminal
@return the non-terminal, or null if it is not in this grammar
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/grammars/AbstractAssemblyGrammar.java