Code refactoring and improved error handling for edit user list

Update teststatus

cps/tasks/convert.py

@@ -75,8 +75,8 @@ class TaskConvert(CalibreTask):
                                                            self.settings['body'],
                                                            internal=True)
                                       )
-                except Exception as e:
-                    return self._handleError(str(e))
+                except Exception as ex:
+                    return self._handleError(str(ex))
 
     def _convert_ebook_format(self):
         error_message = None

cps/tasks/mail.py

@@ -158,9 +158,9 @@ class TaskEmail(CalibreTask):
         except socket.error as e:
             log.debug_or_exception(e)
             self._handleError(u'Socket Error sending email: {}'.format(e.strerror))
-        except Exception as e:
-            log.debug_or_exception(e)
-            self._handleError(u'Error sending email: {}'.format(e))
+        except Exception as ex:
+            log.debug_or_exception(ex)
+            self._handleError(u'Error sending email: {}'.format(ex))
 
 
     def send_standard_email(self, msg):