fix a stack trace when trying to loadpath a non-existant directory

git-svn-id: file:///home/svn/framework3/trunk@11714 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/core/module_manager.rb

@@ -605,16 +605,18 @@ class ModuleManager < ModuleSet
 		path.sub!(/#{File::SEPARATOR}$/, '')
 
 		# Make the path completely canonical
-		path = File.expand_path(path)
-		path = Pathname.new(path).realpath.to_s
+		path = Pathname.new(File.expand_path(path))
 
 		# Make sure the path is a valid directory before we try to rock the
 		# house
-		if (File.directory?(path) == false)
+		unless (path.directory?)
 			raise RuntimeError, "The path supplied is not a valid directory.",
 				caller
 		end
 
+		# Now that we've confirmed it exists, get the full, cononical path
+		path = path.realpath.to_s
+
 		module_paths << path
 
 		begin