MediaWiki reader: allow empty quoted attributes.

Closes #10490.

src/Text/Pandoc/Readers/MediaWiki.hs

@@ -253,7 +253,7 @@ parseAttr = try $ do
   skipMany spaceChar
   char '='
   skipMany spaceChar
-  v <- (char '"' >> many1TillChar (satisfy (/='\n')) (char '"'))
+  v <- (char '"' >> manyTillChar (satisfy (/='\n')) (char '"'))
        <|> many1Char (satisfy $ \c -> not (isSpace c) && c /= '|')
   return (k,v)
 

test/command/10490.md

@@ -0,0 +1,50 @@
+```
+% pandoc -f mediawiki -t html
+{|class="wikitable" style="text-align: center;"
+|-
+!rowspan=3 style=""|Witness program version
+!colspan=4 style=""|Hash size
+|-
+!Mainnet
+!Testnet
+!Mainnet
+!Testnet
+|-
+|0||p2||QW||7Xh||T7n
+|-
+|1||p4||QY||7Xq||T7w
+|}
+^D
+<table>
+<thead>
+<tr>
+<th style=""><p>Witness program version</p></th>
+<th colspan="4" style=""><p>Hash size</p></th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td><p>Mainnet</p></td>
+<td><p>Testnet</p></td>
+<td><p>Mainnet</p></td>
+<td><p>Testnet</p></td>
+<td></td>
+</tr>
+<tr>
+<td><p>0</p></td>
+<td><p>p2</p></td>
+<td><p>QW</p></td>
+<td><p>7Xh</p></td>
+<td><p>T7n</p></td>
+</tr>
+<tr>
+<td><p>1</p></td>
+<td><p>p4</p></td>
+<td><p>QY</p></td>
+<td><p>7Xq</p></td>
+<td><p>T7w</p></td>
+</tr>
+</tbody>
+</table>
+
+```