Fix GH #5411. When precompiling, params method is undefined.

[kennyj]

If we execute assets:precompile, params method is undefined.
But ruby can't judge that params is method (or localvariable). Thus we should rescue NameError.

Please see #5411

BTW: NoMethodError's superclass is NameError.

[kennyj]

I send PR to 3-2-stable, because we don't have rails_helper.rb on master.
I think that we should fix rails/sprockets-rails.

/cc @guilleiguaran

[guilleiguaran]

@kennyj why the test is in asset_debugging_test.rb instead of assets_test.rb? it's failing only when debugging is on?

[kennyj]

@guilleiguaran You're right. I thought the original problem was related to debug, so I wrote in asset_debugging_test.rb. But now I think that this one wasn't related to it. I'll move it to assets_test.rb.

[kennyj]

done.

[guilleiguaran]

@spastorino @josevalim please review this

[josevalim]

👍 @guilleiguaran can you port to it to sprockets-rails gem as well? thanks.

[kennyj]

I sent a PR to sprockets-rails (for rails master).
rails/sprockets-rails#1