remove unnecessary if clause and move logic to optional partial

app/views/projects/pipelines/_info.html.haml

+- commit = local_assigns.fetch(:commit)
 
-- if @commit.present?
-  .commit-box
+- return unless commit&.present?
+
+.commit-box
   %h3.commit-title
-      = markdown(@commit.title, pipeline: :single_line)
-    - if @commit.description.present?
+    = markdown(commit.title, pipeline: :single_line)
+  - if commit.description.present?
     .commit-description<
-        = preserve(markdown(@commit.description, pipeline: :single_line))
+      = preserve(markdown(commit.description, pipeline: :single_line))
 
-  .info-well
-    - if @commit.status
+.info-well
+  - if commit.status
     .well-segment.pipeline-info
       .icon-container
         = icon('clock-o')
@@ -25,7 +27,7 @@
   .well-segment.branch-info
     .icon-container.commit-icon
       = custom_icon("icon_commit")
-      = link_to @commit.short_id, project_commit_path(@project, @pipeline.sha), class: "commit-sha js-details-short"
+    = link_to commit.short_id, project_commit_path(@project, @pipeline.sha), class: "commit-sha js-details-short"
     = link_to("#", class: "js-details-expand d-none d-sm-none d-md-inline") do
       %span.text-expander
         = sprite_icon('ellipsis_h', size: 12)

app/views/projects/pipelines/show.html.haml

@@ -7,8 +7,7 @@
 
   #js-pipeline-header-vue.pipeline-header-container
 
-  - if @commit
-    = render "projects/pipelines/info"
+  = render "projects/pipelines/info", commit: @pipeline.commit
 
   = render "projects/pipelines/with_tabs", pipeline: @pipeline