Handle nil blob names

lib/linguist/file_blob.rb

@@ -34,7 +34,7 @@ module Linguist
 
     # Public: Read file permissions
     #
-    # Returns a String like '0100644'
+    # Returns a String like '100644'
     def mode
       File.stat(@path).mode.to_s(8)
     end

lib/linguist/language.rb

@@ -94,7 +94,7 @@ module Linguist
     #
     # Returns Language or nil.
     def self.detect(blob)
-      name = blob.name
+      name = blob.name.to_s
 
       # A bit of an elegant hack. If the file is executable but extensionless,
       # append a "magic" extension so it can be classified with other

lib/linguist/version.rb

@@ -1,3 +1,3 @@
 module Linguist
-  VERSION = "2.13.0.github3"
+  VERSION = "2.13.0.github4"
 end