ActivationStrategy - missing parameter in default strategy

[epicatization]

No description provided.

[epicatization]

Hello,
While using default strategy, the response from unleash-server is:

{
  "name"=>"test-flag",
  "description"=>"Test flag.",
  "enabled"=>false,
  "strategies"=>[{"name"=>"default"}],
  "variants"=>nil,
  "createdAt"=>"2019-04-17T06:41:19.140Z"
 }

So based on
https://github.com/Unleash/unleash-client-ruby/blob/4f91fb12eace99ea787050d33b30dc6761d17b8f/lib/unleash/activation_strategy.rb
It will log warning when parameters key is nil.

[coveralls]

Pull Request Test Coverage Report for Build 153

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 99.038%

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Totals
Change from base Build 137:	0.2%
Covered Lines:	309
Relevant Lines:	312

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💛 - Coveralls

[rarruda]

Thanks for the contribuition/PR. It looks great!