private boolean includeValue(String value) {
        if (includeEmpty) {
            return true;
        }
        if (StringUtils.isBlank(value)) {
            return false;
        }
        return true;
    }
Tests for null or empty. Does not check for length
@param value
@return
tika-core/src/main/java/org/apache/tika/metadata/writefilter/StandardWriteFilter.java