Web socket transport fix

[norlyakov]

What do these changes do?

Set WebSocketTransport to ignore empty frames and added the ability to process multi messages from clients.

Are there changes in behavior for the user?

The server will not decode json messages in frames anymore. '["{\"foo\": 123}"]' => "{\"foo\": 123}"

Added ability to process multi messages in a single frame from the client: '["msg1", "msg2"]'

Related issue number

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist
• [ ] Documentation reflects the changes
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
  • .feature: Signifying a new feature.
  • .bugfix: Signifying a bug fix.
  • .doc: Signifying a documentation improvement.
  • .removal: Signifying a deprecation or removal of public API.
  • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov[bot]]

Codecov Report

Merging #383 into master will increase coverage by 1.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
+ Coverage   75.51%   76.55%   +1.03%     
==========================================
  Files          16       16              
  Lines         866      866              
  Branches      122      122              
==========================================
+ Hits          654      663       +9     
+ Misses        177      169       -8     
+ Partials       35       34       -1     

Impacted Files	Coverage Δ
sockjs/transports/websocket.py	63.38% <100.00%> (+12.67%)	:arrow_up:

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