Contacts can't handle contact picture if TYPE is missing

[minils]

Steps to reproduce

1. Import a VCF File including contacts with the tag

PHOTO;ENCODING=BASE64;JPEG:/9j/...

(Some programs omit the TYPE= attribute)
2. Contact pictures don't get included.

Expected behaviour

The pictures should still be imported.
If the first line of the picture is:

PHOTO;ENCODING=BASE64;JPEG:/9j/...

instead of:

PHOTO;ENCODING=BASE64;TYPE=JPEG:/9j/...

Actual behaviour

The pictures are not imported at all.

Server configuration

Operating system: Debian 8

Web server: nginx 1.6.2

Database: mysql 5.5.50-0+deb8u1

PHP version: PHP 5.6.23-0+deb8u1

Nextcloud version: 9.0.52

Updated from an older Nextcloud/ownCloud or fresh install: Updated from ownCloud 9.0.2

Where did you install Nextcloud from: From tar ball

List of activated apps:

App list

Enabled:
  - activity: 2.2.1
  - admin_audit: 1.0.0
  - calendar: 1.2.2
  - comments: 0.2
  - contacts: 1.3.1.0
  - dav: 0.1.6
  - documents: 0.12.0
  - federatedfilesharing: 0.1.0
  - federation: 0.0.4
  - files: 1.4.4
  - files_pdfviewer: 0.8.1
  - files_sharing: 0.9.1
  - files_texteditor: 2.1
  - files_trashbin: 0.8.0
  - files_versions: 1.2.0
  - files_videoplayer: 0.9.8
  - firstrunwizard: 1.1
  - gallery: 14.5.0
  - notifications: 0.2.3
  - password_policy: 1.0.0
  - provisioning_api: 0.4.1
  - systemtags: 0.2
  - templateeditor: 0.1
  - theming: 0.1.0
  - updatenotification: 0.1.0

### Client configuration

Browser: Mozilla Firefox 47.0.1

Operating system: Fedora 24

[MorrisJobke]

cc @georgehrke

[skjnldsv]

PHOTO;ENCODING=BASE64;JPEG:/9j/...

PHOTO;ENCODING=BASE64;TYPE=JPEG:/9j/...

Neither of them are valid according to the rfc.
https://tools.ietf.org/html/rfc6350#section-6.2.4
https://tools.ietf.org/html/rfc2426#section-3.1.4

So we are compliant with the carddav rules