Consistency in warnings.

lib/liquid/block.rb

@@ -67,10 +67,8 @@ module Liquid
       all_warnings = []
       all_warnings.concat(@warnings) if @warnings
 
-      return all_warnings unless @children
       @children.each do |node|
-        node_warns = node.respond_to?(:warnings) ? node.warnings : nil
-        all_warnings.concat(node_warns) if node_warns
+        all_warnings.concat(node.warnings || [])
       end
 
       all_warnings

lib/liquid/variable.rb

@@ -18,7 +18,6 @@ module Liquid
     def initialize(markup, options = {})
       @markup  = markup
       @name    = nil
-      @warnings = []
       @options = options || {}
       
 
@@ -29,6 +28,7 @@ module Liquid
         begin
           strict_parse(markup)
         rescue SyntaxError => e
+          @warnings ||= []
           @warnings << e
           lax_parse(markup)
         end