Summary can now rely on `image_url` instead of `image_name`. This
parameter can be manually entered by the user if Auto-Summary cannot
find the proper mail.content file to get image name and image sha256
automatically.
This is more flexible than only asking for `image_name` because in some
cases, the WebDAV URI does not match
`/share/{self.project_name}/{self.series_name}/{self.milestone_name}/`.
Because of this, the argument `created_before` in the `get_new_bugs()`
method was always set to the date when it was called for the first time.
After a while, users would not get the exepcted results, since most new
bugs would have been created after this date, and would be ignored by
autosummary.
fix: make sure to send lists to Jinja template for reports and hardware
hardware, full_test_reports and stress_test_reports are obtained using
the get() method on an HTML form, so by default they return an empty
string.
When generating the summary report, send lists instead of potentially
empty strings in order to prevent concatenating str and list in the
Jinja templates.
Perform additional stripping to make sure we ignore lines with spaces
only and to remove un-necessary spaces on non-empty lines.
