[rubygems/rubygems] Remove more unused code

rubygems/rubygems@986e889a79

lib/bundler.rb

@@ -662,16 +662,11 @@ def configure_gem_home_and_path
     end
 
     def configure_gem_path(env = ENV)
-      blank_home = env["GEM_HOME"].nil? || env["GEM_HOME"].empty?
-      if !use_system_gems?
+      unless use_system_gems?
         # this needs to be empty string to cause
         # PathSupport.split_gem_path to only load up the
         # Bundler --path setting as the GEM_PATH.
         env["GEM_PATH"] = ""
-      elsif blank_home
-        possibles = [Bundler.rubygems.gem_dir, Bundler.rubygems.gem_path]
-        paths = possibles.flatten.compact.uniq.reject(&:empty?)
-        env["GEM_PATH"] = paths.join(File::PATH_SEPARATOR)
       end
     end