Null object properties not supported in seed

[mbruning24]

Actual Behaviour

Seed does not support objects with a top-level property that has a null value. { a: '1', b: null } does not work { a: '1', b: '2' } works Note nested null values work ({ a: '1', b: { c: '2', d: null } } works)

Expected Behaviour

Seed objects should allow for the "null" value in a top-level property.

Steps to reproduce it

1. Create a seed file with a null property (i.e. { a: '1', b: null })
2. Run start with seed
3. Crash with cannot read property 'type' of null error

LogCat for the issue

$ sls dynamodb start --seed=dev
Dynamodb Local Started, Visit: http://localhost:8000/shell
Serverless: DynamoDB - created table test-db

  Type Error ---------------------------------------------

  Cannot read property 'type' of null

     For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

  Stack Trace --------------------------------------------

TypeError: Cannot read property 'type' of null
    at ____\node_modules\serverless-dynamodb-local\src\seeder.js:100:14
    at ____\node_modules\lodash\lodash.js:4925:15
    at baseForOwn (____\node_modules\lodash\lodash.js:3010:24)
    at ____\node_modules\lodash\lodash.js:4894:18
    at Function.forEach (____\node_modules\lodash\lodash.js:9342:14)
    at unmarshalBuffer (____\node_modules\serverless-dynamodb-local\src\seeder.js:98:5)
    at arrayEach (____\node_modules\lodash\lodash.js:516:11)
    at Function.forEach (____\node_modules\lodash\lodash.js:9342:14)
    at getSeedsAtLocation (____\node_modules\serverless-dynamodb-local\src\seeder.js:120:14)
    at fileExists.then (____\node_modules\serverless-dynamodb-local\src\seeder.js:140:14)
From previous event:
    at PluginManager.invoke (%APPDATA%\npm\node_modules\serverless\lib\classes\PluginManager.js:368:22)
    at PluginManager.run (%APPDATA%\npm\node_modules\serverless\lib\classes\PluginManager.js:399:17)
    at variables.populateService.then (%APPDATA%\npm\node_modules\serverless\lib\Serverless.js:102:33)
    at runCallback (timers.js:672:20)
    at tryOnImmediate (timers.js:645:5)
    at processImmediate [as _immediateCallback] (timers.js:617:5)
From previous event:
    at Serverless.run (%APPDATA%\npm\node_modules\serverless\lib\Serverless.js:89:74)
    at serverless.init.then (%APPDATA%\npm\node_modules\serverless\bin\serverless:42:50)

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Forums:        forum.serverless.com
     Chat:          gitter.im/serverless/serverless

  Your Environment Information -----------------------------
     OS:                     win32
     Node Version:           6.11.3
     Serverless Version:     1.25.0

I removed local filesystem prefixes, ____ is the project directory

Screenshots of the issue

N/A

Would you like to work on the issue?

In src/seeder.js you should just be able to add a null check to the unmarshalBuffer function on line 99: if (value !== null && value.type==="Buffer") instead of if (value.type==="Buffer") I won't have time to work on it, but I know this works with the cases I have.

[terencenero007]

@mbruning24 I would like to work on the issue and have already fixed it, the only thing is that I want to introduce the fix as a feature. An issue that is related to the same is raised here #169 . The issue #169 will come when you add the condition above, I have fixed both issues in a configurable way. I have also mentioned the same on gitter. Let me know if I can work on this Thanks.