[bandcamp] crashes on paid tracks

[PSlash]

Latest git-version '22d7368dfb384e7698faad6d2891b4aaceab3d7c' crashes on attempt to download
http://music.bucketheadpikes.com/track/crumple-part-two
This track is not playable in browser. Thus it could be better to display any error text.

bash-3.2$ ./youtube-dl -v http://music.bucketheadpikes.com/track/crumple-part-two
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://music.bucketheadpikes.com/track/crumple-part-two']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.11.27.1
[debug] Python version 2.7.10 - Darwin-14.5.0-x86_64-i386-64bit
[debug] exe versions: avconv v10_beta1-440-gb33c64e, avprobe v10_beta1-440-gb33c64e, ffmpeg 2.8.2, ffprobe 2.8.2
[debug] Proxy map: {}
[generic] crumple-part-two: Requesting header
WARNING: Falling back on generic information extractor.
[generic] crumple-part-two: Downloading webpage
[generic] crumple-part-two: Extracting information
[Bandcamp] crumple-part-two: Downloading webpage
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
"main", fname, loader, pkg_name)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "./youtube-dl/main.py", line 19, in
File "./youtube-dl/youtube_dl/init.py", line 410, in main
File "./youtube-dl/youtube_dl/init.py", line 400, in _real_main
File "./youtube-dl/youtube_dl/YoutubeDL.py", line 1669, in download
File "./youtube-dl/youtube_dl/YoutubeDL.py", line 674, in extract_info
File "./youtube-dl/youtube_dl/YoutubeDL.py", line 727, in process_ie_result
File "./youtube-dl/youtube_dl/YoutubeDL.py", line 663, in extract_info
File "./youtube-dl/youtube_dl/extractor/common.py", line 290, in extract
File "./youtube-dl/youtube_dl/extractor/bandcamp.py", line 53, in _real_extract
AttributeError: 'NoneType' object has no attribute 'items'

[yan12125]

There's no music there, and a proper message will be displayed in the next version.