Only access properties of objects on Context.lookup

mustache.js

@@ -368,7 +368,7 @@
 
           while (value != null && index < names.length)
             value = value[names[index++]];
-        } else {
+        } else if (typeof context.view == 'object') {
           value = context.view[name];
         }
 

test/_files/bug_length_property.js

@@ -0,0 +1,3 @@
+({
+    length: 'hello'
+})

test/_files/bug_length_property.mustache

@@ -0,0 +1 @@
+{{#length}}The length variable is: {{length}}{{/length}}

test/_files/bug_length_property.txt

@@ -0,0 +1 @@
+The length variable is: hello