set cert_chain to [] instead of nil to prevent bundling errors

Author: jf647

eventmachine_httpserver.gemspec

@@ -6,7 +6,7 @@ Gem::Specification.new do |s|
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Francis Cianfrocca"]
-  s.cert_chain = nil
+  s.cert_chain = []
   s.date = %q{2007-03-16}
   s.description = %q{}
   s.email = %q{garbagecat10@gmail.com}