SONAR-5998 Fail to render the measures page when the parameter pageSi…

…ze does not contain an integer

server/sonar-web/src/main/webapp/WEB-INF/app/models/api/pagination.rb

@@ -34,13 +34,16 @@ class Api::Pagination
   attr_accessor :page_entries
 
   def initialize(options={})
-    @per_page=options[:per_page]||DEFAULT_PER_PAGE
+    @per_page=options[:per_page].to_i||DEFAULT_PER_PAGE
     @page=options[:page].to_i
     @page=1 if @page<1
     @count = options[:count].to_i
   end
 
   def pages
+    if per_page <= 0
+      return 0
+    end
     p=(count / per_page)
     p+=1 if count % per_page>0
     p