Fix possible crash in MD005/list-indent, reporting issue with MD029/ol-prefix.

lib/md005.js

@@ -19,6 +19,7 @@ module.exports = {
       list.items.forEach((item) => {
         const { line, lineNumber } = item;
         const actualIndent = indentFor(item);
+        let match = null;
         if (list.unordered) {
           addErrorDetailIf(
             onError,
@@ -30,8 +31,7 @@ module.exports = {
             rangeFromRegExp(line, listItemMarkerRe)
             // No fixInfo; MD007 handles this scenario better
           );
-        } else {
-          const match = orderedListItemMarkerRe.exec(line);
+        } else if ((match = orderedListItemMarkerRe.exec(line))) {
           actualEnd = match[0].length;
           expectedEnd = expectedEnd || actualEnd;
           const markerLength = match[1].length + 1;

lib/md029.js

@@ -51,12 +51,14 @@ module.exports = {
       // Validate each list item marker
       items.forEach((item) => {
         const match = orderedListItemMarkerRe.exec(item.line);
-        addErrorDetailIf(onError, item.lineNumber,
-          String(current), !match || match[1],
-          "Style: " + listStyleExamples[listStyle], null,
-          rangeFromRegExp(item.line, listItemMarkerRe));
-        if (listStyle === "ordered") {
-          current++;
+        if (match) {
+          addErrorDetailIf(onError, item.lineNumber,
+            String(current), match[1],
+            "Style: " + listStyleExamples[listStyle], null,
+            rangeFromRegExp(item.line, listItemMarkerRe));
+          if (listStyle === "ordered") {
+            current++;
+          }
         }
       });
     });

test/lists-with-nesting.md

@@ -93,3 +93,7 @@
              - six
                1. seven
                   - eight
+
+ * 1. Item {MD004} {MD006} {MD007}
+ * 2. Item {MD004} {MD006} {MD007}
+ * 3. Item {MD004} {MD006} {MD007}