after some discussion with Kazuhiko, it's better to force format to png....

after some discussion with Kazuhiko, it's better to force format to png. Original format might not be possible to display on the browser, like TIFF or old mac's PICT etc. but PNG should be supported in all modern browsers.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34358 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewFieldLibrary/my_thumbnail.xml

@@ -262,7 +262,7 @@
                 </item>
                 <item>
                     <key> <string>image_format</string> </key>
-                    <value> <string></string> </value>
+                    <value> <string>png</string> </value>
                 </item>
                 <item>
                     <key> <string>image_resolution</string> </key>

product/ERP5/bootstrap/erp5_core/bt/revision

-1553
\ No newline at end of file
+1554
\ No newline at end of file