Fix search with key word=nil

app/controllers/search_controller.rb

@@ -37,8 +37,13 @@ class SearchController < ApplicationController
   end
 
   def escape_characters_in_string(keyword)
-    pattern = /(\+|\-|\&|\||\!|\(|\)|\{|\}|\[|\]|\^|\"|\~|\*|\?|\:|\\)/
-    return keyword.gsub(pattern){|match|"\\"  + match}
+    if keyword == ""
+      flash[:danger] = "Keyword is null"
+      redirect_to products_path
+    else
+      pattern = /(\+|\-|\&|\||\!|\(|\)|\{|\}|\[|\]|\^|\"|\~|\*|\?|\:|\ |\\)/
+      return keyword.gsub(pattern){|match|"\\"  + match}
+    end
   end
 
 end

app/views/search/search.html.erb

 <% provide(:title, "Search Products") %>
-<h2 class="text-left">Search Products with keyword: <%= params[:keyword] %> - <%= @products.count %> resulfs</h2>
+<h2 class="text-left">Search Products with keyword: "<%= params[:keyword] %>" - <%= @products.count %> resulfs</h2>
 
 <div class="col-md-12" style="text-align: center;">
   <% if @products!= [] %>