Extract empty blob strategy

lib/linguist/strategy/empty_blob.rb

@@ -0,0 +1,10 @@
+module Linguist
+  module Strategy
+    class EmptyBlob
+      def self.call(blob, langauges)
+        # Don't bother with binary contents or an empty file
+        [] if blob.data.nil? || blob.data == ""
+      end
+    end
+  end
+end

lib/linguist/strategy/shebang.rb

@@ -1,5 +1,6 @@
 module Linguist
   module Strategy
+    # Check if there's a shebang line and use that as authoritative
     class Shebang
       def self.call(blob, _)
         Language.find_by_shebang(blob.data)