Merged r2250 and r2251 from trunk.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/0.8-stable@2252 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/time_entry.rb

@@ -32,7 +32,7 @@ class TimeEntry < ActiveRecord::Base
                 :description => :comments
   
   validates_presence_of :user_id, :activity_id, :project_id, :hours, :spent_on
-  validates_numericality_of :hours, :allow_nil => true
+  validates_numericality_of :hours, :allow_nil => true, :message => :activerecord_error_invalid
   validates_length_of :comments, :maximum => 255, :allow_nil => true
 
   def after_initialize
@@ -54,7 +54,7 @@ class TimeEntry < ActiveRecord::Base
   end
   
   def hours=(h)
-    write_attribute :hours, (h.is_a?(String) ? h.to_hours : h)
+    write_attribute :hours, (h.is_a?(String) ? (h.to_hours || h) : h)
   end
   
   # tyear, tmonth, tweek assigned where setting spent_on attributes