#1304 UseCollectionIsEmpty false positive comparing to 1

[szetheli]

This appears to be a regression of [#1230] because the case in question is mentioned in https://sourceforge.net/p/pmd/bugs/1230/

When comparing a collection size to 1, UseCollectionIsEmpty is triggered incorrectly. The problem here is isEmpty is insufficient for this case. I actually want to "do something" if size()==0 or size()==1

public class PMDIsEmptyFalsePositive
{
    public void falsePositive()
    {
        Collection<String> c = new ArrayList<String>();

        if (c.size() <= 1) // false positive
        {
            // do something
        }
    }
}