Raise error when no content is provided

app/services/files/create_service.rb

@@ -16,6 +16,10 @@ module Files
     def validate
       super
 
+      if @file_content.empty?
+        raise_error("You must provide content.")
+      end
+
       if @file_path =~ Gitlab::Regex.directory_traversal_regex
         raise_error(
           'Your changes could not be committed, because the file name ' +

app/services/files/multi_service.rb

@@ -100,6 +100,20 @@ module Files
       if repository.blob_at_branch(params[:branch], action[:file_path])
         raise_error("Your changes could not be committed because a file with the name `#{action[:file_path]}` already exists.")
       end
+
+      if action[:content].empty?
+        raise_error("You must provide content.")
+      end
+    end
+
+    def validate_update(action)
+      if action[:content].empty?
+        raise_error("You must provide content.")
+      end
+
+      if file_has_changed?
+        raise FileChangedError.new("You are attempting to update a file `#{action[:file_path]}` that has changed since you started editing it.")
+      end
     end
 
     def validate_delete(action)
@@ -122,11 +136,5 @@ module Files
         params[:actions][index][:content] = blob.data
       end
     end
-
-    def validate_update(action)
-      if file_has_changed?
-        raise FileChangedError.new("You are attempting to update a file `#{action[:file_path]}` that has changed since you started editing it.")
-      end
-    end
   end
 end

app/services/files/update_service.rb

@@ -18,6 +18,10 @@ module Files
     def validate
       super
 
+      if @file_content.empty?
+        raise_error("You must provide content.")
+      end
+
       if file_has_changed?
         raise FileChangedError.new("You are attempting to update a file that has changed since you started editing it.")
       end

lib/gitlab/git/index.rb

@@ -106,8 +106,6 @@ module Gitlab
 
       def add_blob(options, mode: nil)
         content = options[:content]
-        return unless content
-
         content = Base64.decode64(content) if options[:encoding] == 'base64'
 
         detect = CharlockHolmes::EncodingDetector.new.detect(content)