allow for False class as filter value

lib/statistics.rb

@@ -64,7 +64,7 @@ def define_statistic(name, options)
           scoped_options = Marshal.load(Marshal.dump(options))
 
           filters.each do |key, value|
-            if value
+            unless value.nil?
               sql = ((@filter_all_on || {}).merge(scoped_options[:filter_on] || {}))[key].gsub("?", "'#{value}'")
               sql = sql.gsub("%t", "#{table_name}")
               sql_frag = send(:sanitize_sql_for_conditions, sql)

statistics.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Alexandru Catighera"]
-  s.date = %q{2010-01-15}
+  s.date = %q{2010-02-18}
   s.email = %q{acatighera@gmail.com}
   s.extra_rdoc_files = [
     "README.markdown"