Allow use of fallback class loading solution

[pboling]

LoadError is the critical one to rescue here, but it does not descend from StandardError so the fallback loading is never invoked.

>> LoadError.ancestors
=> [LoadError, ScriptError, Exception, Object, Kernel, BasicObject]

BEFORE THIS FIX:

$ bundle exec annotate
D, [2017-06-02T13:02:41.484425 #16758] DEBUG -- :   ActiveRecord::SchemaMigration Load (0.2ms)  SELECT `schema_migrations`.* FROM `schema_migrations` /*application:Tophatter*/
/Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:495:in `load_missing_constant': Unable to autoload constant CsvRequest, expected /Users/pboling/Documents/tophatter/app/models/csv_request.rb to define it (LoadError)
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/dependencies.rb:184:in `const_missing'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/inflector/methods.rb:261:in `const_get'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/inflector/methods.rb:261:in `block in constantize'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/inflector/methods.rb:259:in `each'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/inflector/methods.rb:259:in `inject'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.7.1/lib/active_support/inflector/methods.rb:259:in `constantize'
	from /Users/pboling/.rvm/gems/ruby-2.2.6/gems/annotate-2.7.2/lib/annotate/annotate_models.rb:615:in `get_loaded_model'

After this fix:

$ bundle exec annotate
Annotated (###): app/models/...

then

$ bundle exec annotate
Model files unchanged.

[ctran]

Thanks!!!