Set tokenizer_separator to nil by default, add a check for not nil an…

…d not blank to prevent breaking search

lib/middleman-search/extension.rb

@@ -9,7 +9,7 @@ class SearchExtension < Middleman::Extension
     option :index_path, 'search.json', 'Index file path'
     option :pipeline, {}, 'Javascript pipeline functions to use in lunr index'
     option :pipeline_remove, {}, 'Default pipeline functions to remove'
-    option :tokenizer_separator, {}, 'Replace the default tokizer separator'
+    option :tokenizer_separator, nil, 'Replace the default tokizer separator'
     option :cache, false, 'Avoid the cache to be rebuilt on every request in development mode'
     option :language, 'en', 'Language code ("es", "fr") to use when indexing site\'s content'
     option :lunr_dirs, [], 'Directories in which to look for custom lunr.js files'

lib/middleman-search/search-index-resource.rb

@@ -64,7 +64,7 @@ def build_index
           source << "this.pipeline.add(lunr.Pipeline.registeredFunctions.#{name});"
         end
 
-        if @tokenizer_separator.nil?
+        if @tokenizer_separator.present?
           source << "this.tokenizerFn.seperator = #{@tokenizer_separator}"
         end