ubuntu-webapps-update-index fails to parse multiline fields

[Ilya Voronin]

Ubuntu 13.04, unity-webapps-service 2.5.0~daily13.03.18-0ubuntu1

I've packaged my webapp for http://www.rememberthemilk.com/. It is available through one of configured repositories.
I'm expecting ubuntu-webapps-update-index to update available webapps database, but it fails to do it:

---
$ /usr/bin/ubuntu-webapps-update-index
...
** Message: Investigating webapp: unity-webapps-rmilk

** (process:7279): WARNING **: Failed to parse metadata line ( Remember The Milk Webapp for Unity
), skipping package
---

This happens because package description field is multi-line:

---
$ apt-cache dumpavail
...
Package: unity-webapps-rmilk
Priority: extra
Section: web
Installed-Size: 38
Maintainer: Ilya Voronin <email address hidden>
Architecture: all
Version: 1.0-3
Depends: unity-webapps-common, xdg-utils
Filename: pool/main/u/unity-webapps-rmilk/unity-webapps-rmilk_1.0-3_all.deb
Size: 2134
MD5sum: af87b1c06c7b2fb2751dc2e6e72161b2
SHA1: c9a14fdda9d7ae85ee2c276a5fbd963af6462624
SHA256: 807d2b060e61341dd9f752bfc06aecfe6653d20a9b2a1cf8f85e71ea8937bd29
Description: Unity Webapp for Remember The Milk
 Remember The Milk Webapp for Unity
Ubuntu-Webapps-Domain: rememberthemilk.com
Ubuntu-Webapps-Name: Remember The Milk
Ubuntu-Webapps-Includes: https://*.rememberthemilk.com/*;https://rememberthemilk.com/*

---

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Knickers Brown (metta-crawler)]

Still happens with unity-webapps-service 2.5.0~+16.04.2016020