Rename blob helper, bump version of gitlab_git to 7.2.21.

Gemfile.lock

@@ -298,7 +298,7 @@ GEM
       posix-spawn (~> 0.3)
     gitlab_emoji (0.2.0)
       gemojione (~> 2.1)
-    gitlab_git (7.2.20)
+    gitlab_git (7.2.21)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.7.3)
       github-linguist (~> 4.7.0)

app/helpers/blob_helper.rb

@@ -30,7 +30,7 @@ module BlobHelper
         nil
       end
 
-    if blob && blob.text? && !blob.lfs_pointer?
+    if blob_viewable?(blob)
       text = 'Edit'
       after = options[:after] || ''
       from_mr = options[:from_merge_request_id]
@@ -72,8 +72,8 @@ module BlobHelper
     icon("#{file_type_icon_class('file', mode, name)} fw")
   end
 
-  def viewable?(blob)
-    blob.text? && !blob.lfs_pointer?
+  def blob_viewable?(blob)
+    blob && blob.text? && !blob.lfs_pointer?
   end
 
   def blob_size(blob)

app/views/projects/blob/_actions.html.haml

@@ -3,7 +3,7 @@
   = link_to 'Raw', namespace_project_raw_path(@project.namespace, @project, @id),
       class: 'btn btn-sm', target: '_blank'
   -# only show normal/blame view links for text files
-  - if viewable?(@blob)
+  - if blob_viewable?(@blob)
     - if current_page? namespace_project_blame_path(@project.namespace, @project, @id)
       = link_to 'Normal View', namespace_project_blob_path(@project.namespace, @project, @id),
           class: 'btn btn-sm'

app/views/projects/diffs/_file.html.haml

@@ -25,7 +25,7 @@
             = "#{diff_file.diff.a_mode} → #{diff_file.diff.b_mode}"
 
       .diff-controls
-        - if viewable?(blob)
+        - if blob_viewable?(blob)
           = link_to '#', class: 'js-toggle-diff-comments btn btn-sm active has_tooltip', title: "Toggle comments for this file" do
             %i.fa.fa-comments
            
@@ -40,7 +40,7 @@
   .diff-content.diff-wrap-lines
     -# Skipp all non non-supported blobs
     - return unless blob.respond_to?('text?')
-    - if viewable?(blob)
+    - if blob_viewable?(blob)
       - if diff_view == 'parallel'
         = render "projects/diffs/parallel_view", diff_file: diff_file, project: project, blob: blob, index: i
       - else