Un mail peut ne pas avoir de content_type

app/services/email_importer.rb

@@ -45,10 +45,10 @@ class EmailImporter
       else
         mail.parts[0].decoded
       end
-    elsif mail.content_type.match?(/text\/html/)
-      Nokogiri::HTML(mail.body.decoded).text
+    elsif mail.content_type && mail.content_type.match?(/text\/html/)
+      Nokogiri::HTML(mail.decoded).text
     else
-      mail.body.decoded
+      mail.decoded
     end
   end
 

test/fixtures/files/no_content_type.eml

@@ -0,0 +1,28 @@
+Return-Path: <return-path@example.com>
+Delivered-To: delivered-to-1@example.com
+Received: by mx.example.com (Postfix, from userid 1000)
+	id 8B3187F5D3; Sat, 12 Sep 2020 06:43:04 +0200 (CEST)
+From: from-foo@example.com
+To: Foo <to-foo@example.com>
+Subject: Cron Dummy subject
+Date: Sat, 12 Sep 2020 06:43:02 +0200 (CEST)
+Message-Id: <no-content-type@example.com>
+
+This is a RAID status update from megaraidsas-statusd.  The megaraidsas-status
+program reports that one of the RAIDs changed state:
+
+-- Arrays informations --
+-- ID | Type | Size | Status
+a0d0 | RAID 1 | 476GiB | optimal
+a0d1 | RAID 1 | 278GiB | optimal
+
+-- Disks informations
+-- ID | Model | Status | Warnings
+a0e32s0 | ATA KINGSTON SKC6005 476GiB | online | errs: media:0 other:6 predictive-failure
+a0e32s1 | ATA SAMSUNG MZ7LN512 476GiB a0d0 | predictive-failure
+a0e32s2 | SEAGATE ST3300657SS 279GiB | online
+a0e32s3 | SEAGATE ST3300657SS 279GiB | online
+
+There is at least one disk/array in a NOT OPTIMAL state.
+
+Report from /etc/init.d/megaraidsas-statusd on kampn-kvm00

test/services/email_importer_test.rb

@@ -102,4 +102,12 @@ class EmailImporterTest < ActiveSupport::TestCase
 
     assert_equal expected, actual
   end
+
+  test "mail without content-type" do
+    email = email_from_eml("no_content_type.eml")
+
+    expected = /This is a RAID status update from megaraidsas-statusd/
+
+    assert_match(expected, email.plain_body)
+  end
 end