void setProgram(Program program) {
		this.program = program;
		tempClipboard.setContents(null, this);
		if (viewList != null) {
			viewList.clear();
		}
	}
Notifies tree object that it is no longer the owner of
the contents of the clipboard.
@param clipboard the clipboard that is no longer owned
@param contents the contents which tree owner had placed on the clipboard
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/programtree/ProgramTreeActionManager.java