Allow setting ca without setting a verify mode

The CA setting is how we can include intermediate keys, but the binder won't set it unless you force client certs.

Author: peterkeen

lib/puma/binder.rb

@@ -164,8 +164,9 @@ def parse(binds, logger)
               unless params['ca']
                 @events.error "Please specify the SSL ca via 'ca='"
               end
-              ctx.ca = params['ca']
             end
+            
+            ctx.ca = params['ca']
 
             if  params['verify_mode']
               ctx.verify_mode = case params['verify_mode']