path.rb in build-files-0.3.0

- old
+ new

@@ -40,10 +40,10 @@
 			def self.shortest_path(path, root)
 				path_components = Path.components(path)
 				root_components = Path.components(root)
 				
 				# Find the common prefix:
-				i = prefix_length(path_components, root_components)
+				i = prefix_length(path_components, root_components) || 0
 				
 				# The difference between the root path and the required path, taking into account the common prefix:
 				up = root_components.size - i
 				
 				return File.join([".."] * up + path_components[i..-1])