[datatables] Special:Ask: Error when using intro or outro parameter

[YvarRavy]

Setup

• MW version: 1.39
• DB (MySQL etc.): i don't think that matters here
• PHP version: 7.4
• SMW version: 4.1.3
• SRF version: 4.2.1

Issue

When trying to add either an intro or outro text and search for the results with format datatables you get a big error, when you are using the special:Ask page

Steps to reproduce (recommendation is to use the sandbox)
the sandbox gives a different error because of the Extension:PageInCat
but the way to reproduce the error on any other wiki with SMW & SRF

1. Create ask query doesn't really mattter what i just use [[Category:+]]
2. Use Format=Datatables
3. under Parameters fill in either the intro or outro input field
5. fetch results

Expected result:
the normal results with the outro and intro added to the front and back
Observed result:
Fatal error
Stacktrace

[c127aab4f08c39dcf86f038c] /index.php?title=Speciaal:Vragen& Error: Call to a member function getMaxIncludeSize() on null

Backtrace:

from mediawiki/includes/parser/Parser.php(2937)
#0 mediawiki/includes/parser/Parser.php(1609): Parser->replaceVariables(string)
#1 mediawiki/includes/parser/Parser.php(881): Parser->internalParse(string, boolean, boolean)
#2 mediawiki/includes/parser/Parser.php(905): Parser->recursiveTagParse(string, boolean)
#3 composer-ext/SemanticResultFormats/formats/datatables/DataTables.php(483): Parser->recursiveTagParseFully(string)
#4 composer-ext/SemanticResultFormats/formats/datatables/DataTables.php(445): SRF\DataTables->handleNonFileResult(string, SMW\Query\QueryResult, integer)
#5 composer-ext/SemanticMediaWiki/src/Query/ResultPrinters/ResultPrinter.php(304): SRF\DataTables->buildResult(SMW\Query\QueryResult)
#6 composer-ext/SemanticMediaWiki/src/MediaWiki/Specials/SpecialAsk.php(500): SMW\Query\ResultPrinters\ResultPrinter->getResult(SMW\Query\QueryResult, array, integer)
#7 composer-ext/SemanticMediaWiki/src/MediaWiki/Specials/SpecialAsk.php(314): SMW\MediaWiki\Specials\SpecialAsk->fetchResults(SRF\DataTables, SMWQuery, SMW\Utils\UrlArgs)
#8 composer-ext/SemanticMediaWiki/src/MediaWiki/Specials/SpecialAsk.php(168): SMW\MediaWiki\Specials\SpecialAsk->makeHTMLResult()
#9 mediawiki/includes/specialpage/SpecialPage.php(701): SMW\MediaWiki\Specials\SpecialAsk->execute(NULL)
#10 mediawiki/includes/specialpage/SpecialPageFactory.php(1428): SpecialPage->run(NULL)
#11 mediawiki/includes/MediaWiki.php(316): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, RequestContext)
#12 mediawiki/includes/MediaWiki.php(904): MediaWiki->performRequest()
#13 mediawiki/includes/MediaWiki.php(562): MediaWiki->main()
#14 mediawiki/index.php(50): MediaWiki->run()
#15 mediawiki/index.php(46): wfIndexMain()
#16 mediawiki/wikiroot/index.php(7): require(string)
#17 {main}

[thomas-topway-it]

@YvarRavy thanks for reporting this.
Could you please specify that it is caused by using the Special:Ask page to perform the query ?

$this->mOptions is empty in MW Parser when $this->parser->recursiveTagParseFully is called from the function handleNonFileResult (when Datatables is called from a special page) therefore or the Parser options have to be explicitly set or the original solution pointed out by you here #854

			if ( $outputmode == SMW_OUTPUT_HTML && $this->isHTML ) {
				$result = Message::get( [ 'smw-parse', $this->mIntro ], Message::PARSE ) . $result;
			} elseif ( $outputmode !== SMW_OUTPUT_RAW ) {
				$result = $this->mIntro . $result;
			}

(SMW\Query\ResultPrinters\ResultPrinter)
can be used instead.