Commits on Feb 9, 2021

1. Allow addresses to support nil values …

   Users of `:dalli_store` may have been passing an explicit `nil` parameter for the servers:
   
   ```ruby
   config.cache_store = :dalli_cache, nil, { expires_in: 2.hour, compress: true }
   ```
   
   If they simply changed `:dalli_cache` and `:mem_cache_store`, the existing code passes `addresses = [nil]` to Dalli (instead of `nil`), which cause exceptions when people try to access the cache:
   
   ```
   > Rails.cache.fetch('foo')
   NoMethodError: undefined method `match' for nil:NilClass
   ```
   
   This change allows users to continue passing the explicit `nil`, making migrations from `:dalli_store` to `:mem_cache_store` simpler.

   

   movermeyer committed Feb 9, 2021
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