At accesory checkout error 500 & no email reception

[ursus69]

Expected Behavior (or desired behavior if a feature request)

Check out the object and receive confirmation by email to the appropriate user.

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Actual Behavior

An error 500 is displayed, if I go back in to the app the checkout was made. but no email is sent.

Afterwards at checking in everything is perfect the user receives the email confirming checking in.

Please confirm you have done the following before posting your bug report:

• [x ] I have enabled debug mode
• [x ] I have read checked the Common Issues page

---

Please provide answers to these questions before posting your bug report:

• Version of Snipe-IT you're running
  v2.1.1-55-g701c16f
• What OS and web server you're running Snipe-IT on
  Ubuntu 14.04 Apache2
• What method you used to install Snipe-IT (install.sh, manual installation, docker, etc)
  Manual
• If you're getting an error in your browser, include that error
  Error 500
• What specific Snipe-IT page you're on, and what specific element you're interacting with to trigger the error
  Checkout Accessories
• If a stacktrace is provided in the error, include that too.
• Any errors that appear in your browser's error console.
• Confirm whether the error is reproduceable on the demo.
  No
• Include any additional information you can find in app/storage/logs and your webserver's logs.
  Nothing in the logs
• Include what you've done so far in the installation, and if you got any error messages along the way.
  None
• Indicate whether or not you've manually edited any data directly in the database
  Nope

ErrorException thrown with message "Undefined variable: item_serial (View: /opt/snipe-it/app/views/emails/accept-asset.blade.php)"

Stacktrace:
#33 Illuminate\View\Engines\CompilerEngine:handleViewException in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:41
#32 Controllers\Admin\AccessoriesController:postCheckout in <#unknown>:0
#31 Illuminate\Routing\Router:Illuminate\Routing{closure} in <#unknown>:0
#30 ErrorException in /opt/snipe-it/app/storage/views/d0dad54c18516619cb94657173aa3dc6:26
#29 Illuminate\Exception\Handler:handleError in /opt/snipe-it/app/storage/views/d0dad54c18516619cb94657173aa3dc6:26
#28 include in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:37
#27 Illuminate\View\Engines\PhpEngine:evaluatePath in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:56
#26 Illuminate\View\Engines\CompilerEngine:get in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/View.php:134
#25 Illuminate\View\View:getContents in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/View.php:102
#24 Illuminate\View\View:renderContents in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/View/View.php:76
#23 Illuminate\View\View:render in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php:402
#22 Illuminate\Mail\Mailer:getView in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php:272
#21 Illuminate\Mail\Mailer:addContent in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php:147
#20 Illuminate\Mail\Mailer:send in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:214
#19 Illuminate\Support\Facades\Facade:__callStatic in /opt/snipe-it/app/controllers/admin/AccessoriesController.php:409
#18 Illuminate\Support\Facades\Mail:send in /opt/snipe-it/app/controllers/admin/AccessoriesController.php:409
#17 Controllers\Admin\AccessoriesController:postCheckout in <#unknown>:0
#16 call_user_func_array in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/Controller.php:231
#15 Illuminate\Routing\Controller:callAction in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:93
#14 Illuminate\Routing\ControllerDispatcher:call in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:62
#13 Illuminate\Routing\ControllerDispatcher:dispatch in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/Router.php:967
#12 Illuminate\Routing\Router:Illuminate\Routing{closure} in <#unknown>:0
#11 call_user_func_array in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/Route.php:109
#10 Illuminate\Routing\Route:run in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/Router.php:1033
#9 Illuminate\Routing\Router:dispatchToRoute in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Routing/Router.php:1001
#8 Illuminate\Routing\Router:dispatch in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:775
#7 Illuminate\Foundation\Application:dispatch in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:745
#6 Illuminate\Foundation\Application:handle in /opt/snipe-it/vendor/barryvdh/laravel-debugbar/src/Middleware/Stack.php:34
#5 Barryvdh\Debugbar\Middleware\Stack:handle in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Session/Middleware.php:72
#4 Illuminate\Session\Middleware:handle in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Cookie/Queue.php:47
#3 Illuminate\Cookie\Queue:handle in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Cookie/Guard.php:51
#2 Illuminate\Cookie\Guard:handle in /opt/snipe-it/vendor/stack/builder/src/Stack/StackedHttpKernel.php:23
#1 Stack\StackedHttpKernel:handle in /opt/snipe-it/vendor/laravel/framework/src/Illuminate/Foundation/Application.php:641
#0 Illuminate\Foundation\Application:run in /opt/snipe-it/public/index.php:49