Fixed a bug where ~ choked on non-string values.

git-svn-id: svn://hamptoncatlin.com/haml/branches/edge@155 7063305b-7217-0410-af8c-cdc13e5119b9

lib/haml/buffer.rb

@@ -183,6 +183,7 @@ module Haml
     # Isolates the whitespace-sensitive tags in the string and uses Haml::Helpers#flatten
     # to convert any endlines inside them into html entities.
     def find_and_flatten(input)
+      input = input.to_s
       input.scan(/<(textarea|code|pre)[^>]*>(.*?)<\/\1>/im) do |tag, contents|
         input = input.gsub(contents, Haml::Helpers.flatten(contents))
       end

test/results/whitespace_handling.xhtml

@@ -40,4 +40,4 @@
     <strong>indeed!</strong>
   </textarea>
 </div>
-
+13

test/templates/whitespace_handling.haml

@@ -56,3 +56,4 @@
                  to
                                       http://www.network-science.de/ascii/
     %strong indeed!
+~ 13