public Instruction getInstructionAt(Address address) {
		return getInstructionAt(addrMap.getKey(address, false));
	}
Returns the instruction whose min address equals the specified address or null if the 
address is not the beginning address of some code unit.

@param address the min address of the instruction to return

@return the instruction at the specified address, or null if a instruction does not 
exist starting at the given address.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/CodeManager.java