private boolean isBookmarkAllowed(Address addr) {
		MemoryBlock memBlock = program.getMemory().getBlock(addr);
		if (memBlock != null) {
			return memBlock.isInitialized();
		}
		return false;
	}
Check if the called function doesn't return

@return true if the call also falls through to this instruction
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/disassemble/Disassembler.java