Update MD044/proper-names to avoid providing bogus range when proper name could not be found.

lib/md044.js

@@ -40,7 +40,14 @@ module.exports = {
                     // Attempt to fix bad offset due to inline content
                     matchIndex = fullLine.indexOf(wordMatch);
                   }
-                  const range = [ matchIndex + 1, matchLength ];
+                  const range = (matchIndex === -1) ?
+                    null :
+                    [ matchIndex + 1, matchLength ];
+                  const fixInfo = (matchIndex === -1) ? null : {
+                    "editColumn": matchIndex + 1,
+                    "deleteCount": matchLength,
+                    "insertText": name
+                  };
                   addErrorDetailIf(
                     onError,
                     lineNumber,
@@ -49,11 +56,7 @@ module.exports = {
                     null,
                     null,
                     range,
-                    {
+                    fixInfo
-                      "editColumn": matchIndex + 1,
-                      "deleteCount": matchLength,
-                      "insertText": name
-                    }
                   );
                 }
               }

test/proper-names.md

@@ -69,3 +69,15 @@ Bare URL exempt https://github.com/DavidAnson/MARKDOWNLINT {MD034}
 A short paragraph
 about node.js and {MD044}
 javascript. {MD044}
+
+{MD044} `javascript`
+
+{MD044} `code
+javascript`
+
+{MD044} `code
+javascript
+code`
+
+{MD044} `javascript
+code`