[#2280] Added a Billable cell with the green checkbox depending on if a

Time Entry is billable or not.

lib/overhead_time_entry_activity_patch.rb

@@ -39,6 +39,7 @@ module OverheadTimeEntryActivityPatch
       return false unless field
       
       custom_value = self.custom_value_for(field)
+      return false unless custom_value
       
       if field.field_format == 'bool'
         # Map string values to proper booleans

lib/overhead_timesheet_hook.rb

@@ -3,4 +3,13 @@ class OverheadTimesheetHook < Redmine::Hook::ViewListener
   def plugin_timesheet_views_timesheet_group_header(context={})
     return content_tag(:th, l(:overhead_field_billable))
   end
+
+  def plugin_timesheet_views_timesheet_time_entry(context={})
+    time_entry = context[:time_entry]
+    if time_entry && time_entry.billable? 
+      content_tag(:td, image_tag('true.png'))
+    else 
+      content_tag(:td,'') 
+    end 
+  end
 end