Only trigger actual search if a search string is present

app/controllers/search_controller.rb

@@ -2,12 +2,14 @@ class SearchController < ApplicationController
   include SearchHelper
 
   def show
+    return if params[:search].nil? || params[:search].blank?
     @project = Project.find_by(id: params[:project_id]) if params[:project_id].present?
     @group = Group.find_by(id: params[:group_id]) if params[:group_id].present?
     @scope = params[:scope]
     @show_snippets = params[:snippets].eql? 'true'
 
-    @search_results = if @project
+    @search_results = 
+      if @project
         return access_denied! unless can?(current_user, :download_code, @project)
 
         unless %w(blobs notes issues merge_requests wiki_blobs).
@@ -26,10 +28,8 @@ class SearchController < ApplicationController
         unless %w(projects issues merge_requests).include?(@scope)
           @scope = 'projects'
         end
-
         Search::GlobalService.new(current_user, params).execute
       end
-
     @objects = @search_results.objects(@scope, params[:page])
   end