Resolved issue #35

[iravitejakumar]

when image src in article.component.html at commnet footer section is null. It is performing a get call to http://localhost:4200/null . Wrote a ternary operator to change it to empty string if image src is null.

<img [src]="currentUser.image==null?'':currentUser.image" class="comment-author-img" />

[iravitejakumar]

Please close #35 issue if it is resolved.