Avoid exception when MD011/no-reversed-links is not able to report column/length (fixes #339).

lib/md011.js

@@ -20,17 +20,21 @@ module.exports = {
         const line = params.lines[lineNumber - 1];
         const column = unescapeMarkdown(line).indexOf(reversedLink) + 1;
         const length = reversedLink.length;
+        const range = column ? [ column, length ] : null;
+        const fixInfo = column ?
+          {
+            "editColumn": column,
+            "deleteCount": length,
+            "insertText": `[${linkText}](${linkDestination})`
+          } :
+          null;
         addError(
           onError,
           lineNumber,
           reversedLink,
           null,
-          [ column, length ],
-          {
-            "editColumn": column,
-            "deleteCount": length,
-            "insertText": `[${linkText}](${linkDestination})`
-          }
+          range,
+          fixInfo
         );
       }
     });

test/reversed_link.md

@@ -32,3 +32,13 @@ begin: /\B(([\/.])[\w\-.\/=]+)+/, {MD011}
 {begin: '%r\\(', end: '\\)[a-z]*'} {MD011}
 
 return /(?:(?:(^|\/)[!.])|[*?+()|\[\]{}]|[+@]\()/.test(str); {MD011}
+
+## Escaped Parens
+
+(reversed)[link] {MD011}
+
+a ) a ( a )[a]~ {MD011}
+
+<!-- markdownlint-disable no-inline-html-->
+
+a<pre>&rpar; a &lpar; a &rpar;[a]~</pre> {MD011}