Minor change in Modified-Since header handling to un-break LocalFS

lib/python/OFS/Image.py

@@ -84,7 +84,7 @@
 ##############################################################################
 """Image object"""
 
-__version__='$Revision: 1.97 $'[11:-2]
+__version__='$Revision: 1.98 $'[11:-2]
 
 import Globals, string, struct, content_types
 from OFS.content_types import guess_content_type
@@ -195,7 +195,12 @@ class File(Persistent,Implicit,PropertyManager,
         if header is not None:
             header=string.split(header, ';')[0]
             mod_since=int(DateTime(header).timeTime())
-            last_mod =int(self._p_mtime)
+	    
+	    if self._p_mtime:
+                last_mod = int(self._p_mtime)
+	    else:
+	        last_mod = 0
+		
             if last_mod > 0 and last_mod <= mod_since:
                 RESPONSE.setStatus(304)
                 return RESPONSE