fix: added catch for unexpected frontmatter error

validation/guide-folder-checks/frontmatter-check.js

@@ -1,10 +1,10 @@
 const matter = require('gray-matter');
 const _ = require('lodash');
-const dedent = require('dedent');
 
 const frontmatterCheck = (fullPath, isTranslation, fileContent) => {
-  const { data: frontmatter } = matter(fileContent);
   let errors = [];
+  try {
+    const { data: frontmatter } = matter(fileContent);
     if (!frontmatter || _.isEmpty(frontmatter) || !frontmatter.title) {
       errors.push({
         msg: `Misplaced or missing \`title\` keyword in the front matter block. Review the [style guide](https://github.com/freeCodeCamp/freeCodeCamp/blob/master/docs/style-guide-for-guide-articles.md#title) for more details.`,
@@ -17,6 +17,15 @@ const frontmatterCheck = (fullPath, isTranslation, fileContent) => {
         fullPath
       });
     }
+  }
+  catch(err) {
+    errors.push({
+      msg: `Unexpected syntax found in the front matter block. Review Travis CI build Details link above for more details.`,
+      fullPath
+    });
+  }
+
+
   return errors;
 };