public boolean hasFilter() {
		TableFilter<ROW_OBJECT> currentFilter = getTableFilter();
		return !currentFilter.isEmpty();
	}
Returns true if there is a table filter set that is not the {@link NullTableFilter}.

@return true if there is a table filter set.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/threaded/ThreadedTableModel.java