Upgrade ember-math-helpers from 4.0.0 to 5.0.0

Author: VasylMarchuk

app/components/course-page/course-stage-step/community-solution-card/content.hbs

@@ -17,7 +17,7 @@
         @highlightedFile={{highlightedFile}}
         @onPublishToGithubButtonClick={{this.handlePublishToGithubButtonClick}}
         @solution={{@solution}}
-        class={{if (not-eq index (sub @solution.highlightedFiles.length 1)) "mb-4"}}
+        class={{if (not-eq index (sub (or @solution.highlightedFiles.length 0) 1)) "mb-4"}}
       />
     {{/each}}
   {{else}}

package-lock.json

@@ -150,7 +150,7 @@
     "ember-keyboard": "^9.0.3",
     "ember-lifeline": "^7.0.0",
     "ember-load-initializers": "^3.0.1",
-    "ember-math-helpers": "^4.0.0",
+    "ember-math-helpers": "^5.0.0",
     "ember-modifier": "^4.2.0",
     "ember-page-title": "^9.0.3",
     "ember-qunit": "^9.0.1",