fixed packageContainerCode method

[mrForest13]

Hello,

there is an error in packageContainerCode method, let's consider examples:

1. For not empty parentType and codePerTable

def parentType: Option[String] = Some("Example")
def codePerTable: Map[String, String] = Map("Example1" -> "Example1", "Example2" -> "Example2")

it's generate

trait Tables extends Example extends Example1 with Example2

2. For empty parentType and codePerTable

trait Tables extends

[lightbend-cla-validator]

Hi @mrForest13,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Lightbend Contributors License Agreement:

http://www.lightbend.com/contribute/cla

[mrForest13]

I have just signed the CLA :)

[SethTisue]

is this still relevant? is somebody able to review it?

[SethTisue]

It isn't obvious to me how the merge conflict should be resolved. @mrForest13 can you rebase this?

[nafg]

I believe this is fixed by #2149 -- if I'm missing something let me know