Expected behavior

If I enter an invalid URL at the login form, I expect to receive an informative, helpful error message that informs me why I'm not able to log into the app.

Actual behavior

The following error appears if I enter an invalid URL at the login form, which isn't that helpful to users:

"Couldn't connect to WordPress site. There is no valid WordPress site at this address. Check the site address (URL) you entered."

Screenshot:

Steps to reproduce the behavior

1. Navigate to the app's login screen and select the "Log in by entering site address" option.
2. Enter some nonsense text, for example "DFOJDOFJF".

Tested on Pixel, alpha-132 of WordPress for Android

This was raised by @jtreanor and some other recent support rotations as a lot of support requests are made up of users who enter an invalid URL. More informative error messaging could have a positive impact on the number of incoming requests.

iOS version of this issue is here: wordpress-mobile/WordPress-iOS#10294