When there are multiple accounts associated with a Chase online banking
user, the dashboard page layout changes. Detailed account history is no
longer shown, so the elements we were waiting for in the "Waiting for
page to load completely" step never appear. Since we're navigating
directly to the download account transactions page now, anyway, we do
not even need to wait for this button to appear.
Although it is undocumented, *ntfy* accepts a `Message` header along
with a file upload, which sets the message content of the notification
when a file is attached. Since HTTP headers cannot contain multiple
lines, the newline character has to be escaped. The *ntfy* server
performs unescaping automatically.
When there are no transactions in the default display, the *Download
account activity* button is disabled. To avoid failing in this case, we
now navigate directly to the download page. This requires explicitly
selecting the credit card account from the dropdown list, as it is not
pre-filled when the page is loaded directly.
The `ntfyerror` context manager replaces `screenshot_failure` for
handling online banking interaction failures. It has several
advantages, notably:
* takes a screenshot of the browser page *before* logging out
* cleaner suppression of exceptions, with success tracking
* sends an `ntfy` message, with the screenshot attached
Dustin