fix(DocAttribute): Do not treat "0" as an empty value in getOption() (refs #4946)
feat(DocHtmlFormat): Add `displayrowcount` option for array attributes (refs #4944)

`displayrowcount=n` accepts an integer `n` that specifies when the
array's row count is displayed:

    n <= -1 never display array's row count
    n = 0   always display array's row count
    n > 0   display array's row count if row count > n

Default value is "10".
Merge pull request #1279 from eguaj/3.3-A4944

 feat(DocHtmlFormat): Add displayrowcount option (closes #4946)(closes #4944)