Fail gracefully from svn checks (closes #2700) [Rick Olson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2907 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/commands/plugin.rb

@@ -93,8 +93,8 @@ class RailsEnvironment
   end
  
   def use_svn?
-    `svn --version`
-    $?.success?
+    `svn --version` rescue nil
+    !$?.nil? && $?.success?
   end
 
   def use_externals?

railties/lib/tasks/framework.rake

@@ -30,8 +30,8 @@ end
 desc "Lock this application to the Edge Rails (by exporting from Subversion).  Defaults to svn HEAD; do 'rake freeze_edge REVISION=1234' to lock to a specific revision."
 task :freeze_edge do
   $verbose = false
-  `svn --version`
-  unless $?.success?
+  `svn --version` rescue nil
+  unless !$?.nil? && $?.success?
     $stderr.puts "ERROR: Must have subversion (svn) available in the PATH to lock this application to Edge Rails"
     exit 1
   end