Allow using plain() on unsaved dates in HTML forms

copy_url and history want to display the local time of DateHTMLProperty values,
using the plain() method. When the value has not been saved (e.g. when saving
was not possibile due to an error in a different entry field), it is just a
string, so it does not have a local() method.

Author: ThomasAH

CHANGES.txt

@@ -28,6 +28,8 @@ Fixed:
   handle multilink properties. (John Rouillard)
 - issue2550583, issue2550635 Do not limit results with Xapian indexer
   (Thomas Arendsen Hein)
+- Allow using plain() on unsaved dates in HTML forms
+  (Thomas Arendsen Hein)
 
 2013-07-06: 1.5.0
 

roundup/cgi/templating.py

@@ -1704,7 +1704,11 @@ def plain(self, escape=0):
             offset = self._db.getUserTimezone()
         else:
             offset = self._offset
-        return str(self._value.local(offset))
+        try:
+            return str(self._value.local(offset))
+        except AttributeError:
+            # not a date value, e.g. from unsaved form data
+            return str(self._value)
 
     def now(self, str_interval=None):
         """ Return the current time.