Rescue Mail::AddressList parse errors

If a malformed email address makes it's way to normalize_params it
currently explodes resulting in a 500 which Sendgrid retries. If a few
of these come in per day the resulting errors snowball pretty quickly.
The email will never properly parse, of course so retrying is futile.

Author: cjolly

lib/griddler/sendgrid/adapter.rb

@@ -31,6 +31,8 @@ def normalize_params
 
       def recipients(key)
         Mail::AddressList.new(params[key] || '').addresses
+      rescue Mail::Field::IncompleteParseError
+        []
       end
 
       def get_bcc

spec/griddler/sendgrid/adapter_spec.rb

@@ -145,6 +145,12 @@
     normalize_params(params)[:charsets].should eq({})
   end
 
+  it 'does not explode if address is not parseable' do
+    params = default_params.merge(cc: '"Closing Bracket Missing For Some Reason" <[email protected]')
+
+    normalize_params(params)[:cc].should eq([])
+  end
+
   it 'defaults charsets to an empty hash if it is not specified in params' do
     params = default_params.except(:charsets)
     normalize_params(params)[:charsets].should eq({})