Export command should reflect message send fail status

[nus-se-pr-bot]

The export command can save an image of the schedule on my computer but it doesn't send this image to my email.

I've tried to do this in two ways. Use the command: export e/[email protected]

Then, I edited the outlet information and inserted my email, then inputted the above command. I followed this process in admin and non-admin mode. Command still didn't function as stated in the user guide even though the command feedback message claimed that this command was executed successfully.

_{[original: nus-cs2103-AY1718S2/pe-round1#880]}

Issue created by: @a-shakra

[hzxcaryn]

I will add the error feedback for this by the next release.
Need to figure out why the email can't be sent when the internet is connected though..