(FIXUP) Check for nil before injecting provider param into Types

Author: scotje

lib/puppet-strings/yard/code_objects/type.rb

@@ -152,14 +152,15 @@ def parameters
     return @parameters if providers.empty?
 
     # return existing params if we have already added provider
-    return @parameters if @parameters.any? { |p| p.name == 'provider' }
+    return @parameters if @parameters&.any? { |p| p.name == 'provider' }
 
     provider_param = Parameter.new(
       'provider',
       "The specific backend to use for this `#{self.name.to_s}` resource. You will seldom need " + \
       "to specify this --- Puppet will usually discover the appropriate provider for your platform."
     )
 
+    @parameters ||= []
     @parameters << provider_param
   end