Don't capture NameError if its not a missing component

Instead of rescuing NameError we proactively check if the requested
component is available. This is made possible by Zeitwerk using
`autoload` under the hood and having all loadable constants respond
`true` when asked if they are `const_defined?`.

admin/lib/solidus_admin/configuration.rb

@@ -188,14 +188,22 @@ def menu_items
 
  def components
  @components ||= Hash.new do |_h, k|
- "solidus_admin/#{k}/component".classify.constantize
- rescue NameError
- prefix = "#{ENGINE_ROOT}/app/components/solidus_admin/"
- suffix = "/component.rb"
- dictionary = Dir["#{prefix}**#{suffix}"].map { _1.delete_prefix(prefix).delete_suffix(suffix) }
- corrections = DidYouMean::SpellChecker.new(dictionary: dictionary).correct(k.to_s)
-
- raise ComponentNotFoundError, "Unknown component #{k}#{DidYouMean.formatter.message_for(corrections)}"
+ const_name = "solidus_admin/#{k}/component".classify
+
+ unless Object.const_defined?(const_name)
+ prefix = "#{ENGINE_ROOT}/app/components/solidus_admin/"
+ suffix = "/component.rb"
+ dictionary = Dir["#{prefix}**#{suffix}"].map { _1.delete_prefix(prefix).delete_suffix(suffix) }
+ corrections = DidYouMean::SpellChecker.new(dictionary: dictionary).correct(k.to_s)
+
+ raise ComponentNotFoundError.new(
+ "Unknown component #{k}#{DidYouMean.formatter.message_for(corrections)}",
+ k.classify,
+ receiver: ::SolidusAdmin
+ )
+ end
+
+ const_name.constantize
  end
  end