Issue:Mode=category loses letter headings when ordermethod=titlewithoutnamespace

Description:	mode=category should produce headings A, B, C, etc., but does not when ordermethod=titlewithoutnamespace
Extension / Version:	DPL   /   1.8.8
Type / Status:	Bug   /   open

Problem

MediaWiki 1.15.1.

This produces the headings A, B, C, etc., like a category page:

<dpl>
category = African Union member states
mode = category
ordermethod = title
</dpl>

Example:

C

• Cameroon

N

• Nigeria

S

• Somalia
• Sudan

This should produce A, B, C, etc., but does not:

<dpl>
category = African Union member states
mode = category
ordermethod = titlewithoutnamespace
</dpl>

Example:

C

• Cameroon

N

• Nigeria

S

• Somalia
• Sudan

I think the headings are empty or blank, not missing. If you have many items in your list, you will see continuation headings like "cont." instead of "A cont." So I'm guessing the headings are being rendered, but they are blank, so nothing shows up. Here is an example with "cont.":

"

• Issue:"More..." link
• Issue:"eliminate" not working when including last section of a page
• Issue:"reset" and "eliminate" should also suppress magic words

%

• Issue:%PAGE% bug in image link
• Issue:%PAGES% and %TOTALPAGES% won't work together
• Issue:%PAGES% or %TOTALPAGES% in parser functions
• Issue:%TOTALPAGES% is incorrect when allowUnlimitedResults=true

'

• Issue:'tablesortcol' ignored when surrogate template used.

A

• Issue:A problem in the conbination DPL 1.7.4 and MW1.3 using Chinense interface
• Issue:AddContribution missing prefix
• Issue:AddContribution missing prefix regression
• Issue:Add "minimum-number-of-revisions" like Criteria for page selection
• Issue:Add a template in the pages automatically by DPL
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Analysis

In DPL::formatCategoryList, when ordermethod=titlewithoutnamespace, all entries in $aArticles_start_char[] contain the empty string. This is because $this->mArticles[$i]->mStartChar is empty. That's the problem.

This is happening because in DPLMain.php, formatCategoryList() says:

if( isset($row->sortkey) ) {
 $dplArticle->mStartChar = $wgContLang->convert($wgContLang->firstChar($row->sortkey));
} 

but $row->sortkey is not set, so mStartChar does not get set. I changed it to:

if( isset($row->sortkey) ) {
 $dplArticle->mStartChar = $wgContLang->convert($wgContLang->firstChar($row->sortkey));
} else {
 $dplArticle->mStartChar = $wgContLang->convert($wgContLang->firstChar($row->page_title));
}

and things seem to work. What do you think of this patch?