format template error message so cause is up front

lib/kubetruth/template.rb

@@ -193,14 +193,15 @@ def render(*args, **kwargs)
         result
 
       rescue Liquid::Error => e
-        msg = "Template failed to render:\n"
-        @source.lines.each {|l| msg << (INDENT * 2) << l }
-        msg << "\n" << INDENT << "with error message:\n" << (INDENT * 2) << "#{e.message}"
+        msg = "Template failed to render with error message:\n"
+        msg << (INDENT * 2) << e.message << "\n"
         if e.is_a?(Liquid::UndefinedVariable)
-          msg << "\n" << INDENT << "and variable context:\n"
+          msg << INDENT << "and variable context:\n"
           debug_kwargs ||= kwargs.merge(secrets: Hash[secrets.collect {|k, v| [k, "<masked:#{k}>"] }])
           debug_kwargs.deep_stringify_keys.to_yaml.lines.collect {|l| msg << (INDENT * 2) << l }
         end
+        msg << INDENT << "and template source:\n"
+        @source.lines.each {|l| msg << (INDENT * 2) << l }
         raise Error, msg
       end
     end