Do not try to render posts/comments which are not present

refs diaspora/diaspora#4959

app/assets/stylesheets/report.css.scss

@@ -5,6 +5,9 @@
     span {
       display: block;
     }
+    span.text {
+      padding-bottom: 1em;
+    }
   }
   .options {
     float: right;

app/helpers/report_helper.rb

@@ -4,13 +4,14 @@
 
 module ReportHelper
   def report_content(id, type)
-    raw case type
-      when 'post'
-        t('report.post_label', title: link_to(post_page_title(Post.find_by_id(id)), post_path(id)))
-      when 'comment'
-        # comment_message is not html_safe. To prevent
-        # cross-site-scripting we have to escape html
-        t('report.comment_label', data: h(comment_message(Comment.find_by_id(id))))
+    if type == 'post' && !(post = Post.find_by_id(id)).nil?
+      raw t('report.post_label', title: link_to(post_page_title(post), post_path(id)))
+    elsif type == 'comment' && !(comment = Comment.find_by_id(id)).nil?
+      # comment_message is not html_safe. To prevent
+      # cross-site-scripting we have to escape html
+      raw t('report.comment_label', data: h(comment_message(comment)))
+    else
+      raw t('report.not_found')
     end
   end
 end

app/views/report/index.html.haml

@@ -8,7 +8,7 @@
     - @reports.each do |r|
       - username = User.find_by_id(r.user_id).username
       %div.content
-        %span
+        %span.text
           = report_content(r.item_id, r.item_type)
         %span
           = raw t('report.reported_label', person: link_to(username, user_profile_path(username)))

config/locales/diaspora/en.yml

@@ -894,6 +894,7 @@ en:
     review_link: "Mark as reviewed"
     delete_link: "Delete item"
     confirm_deletion: "Are you sure to delete the item?"
+    not_found: "<u>The post/comment was not found. It seams that it was deleted by the user!</u>"
     status:
       marked: "The report was marked as reviewed"
       destroyed: "The post was destroyed"