add PicklableUpload get_content method (#7258)

wcs/qommon/form.py

@@ -687,6 +687,12 @@ class PicklableUpload(Upload):
         # quack like UploadedFile
         return self.get_file_pointer()
 
+    def get_content(self):
+        if hasattr(self, 'qfilename'):
+            filename = os.path.join(get_publisher().app_dir, 'uploads', self.qfilename)
+            return file(filename).read()
+        return None
+
 
 class EmailWidget(StringWidget):
     HTML_TYPE = 'email'