Add error handling to the email task within the convert task

cps/tasks/convert.py

@@ -32,17 +32,20 @@ class TaskConvert(CalibreTask):
     def run(self, worker_thread):
         self.worker_thread = worker_thread
         filename = self._convert_ebook_format()
-        # todo: re-enable this (need to set up gdrive to test with)
+
         if filename:
             if config.config_use_google_drive:
                 gdriveutils.updateGdriveCalibreFromLocal()
             if self.kindle_mail:
                 # if we're sending to kindle after converting, create a one-off task and run it immediately
                 # todo: figure out how to incorporate this into the progress
-                task = TaskEmail(self.settings['subject'], self.results["path"],
+                try:
+                    task = TaskEmail(self.settings['subject'], self.results["path"],
                                filename, self.settings, self.kindle_mail,
                                self.settings['subject'], self.settings['body'], internal=True)
-                task.start()
+                    task.start()
+                except Exception as e:
+                    return self._handleError(str(e))
 
         self._handleSuccess()
         pass