fix: display correct data when user don't have any pull requests (#4452)

* Fix: When user doesn't have any PR, it's Merged PRs Percentage is NAN (fixes #4449)

* review

---------

Co-authored-by: Alexandr <qwerty541zxc@gmail.com>

src/fetchers/stats.js

@@ -297,7 +297,8 @@ const fetchStats = async (
   if (include_merged_pull_requests) {
     stats.totalPRsMerged = user.mergedPullRequests.totalCount;
     stats.mergedPRsPercentage =
-      (user.mergedPullRequests.totalCount / user.pullRequests.totalCount) * 100;
+      (user.mergedPullRequests.totalCount / user.pullRequests.totalCount) *
+        100 || 0;
   }
   stats.totalReviews = user.reviews.totalPullRequestReviewContributions;
   stats.totalIssues = user.openIssues.totalCount + user.closedIssues.totalCount;