merge r11747 from branch 2.2 to trunk

bug 2356 fixed: if the EXIF date can't be parsed, we don't use it to fill the photo date


git-svn-id: http://piwigo.org/svn/trunk@11748 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/include/functions_metadata.php

@@ -97,6 +97,11 @@ function get_sync_exif_data($file)
       {
         $exif[$pwg_key] = $matches[1].'-'.$matches[2].'-'.$matches[3];
       }
+      else
+      {
+        unset($exif[$pwg_key]);
+        continue;
+      }
     }
     $exif[$pwg_key] = addslashes($exif[$pwg_key]);
   }