Groovy: Fixed NPE when using List as parameter type in step definitions

[sjacobs]

To reproduce:

The following code caused a NullPointerException because ParameterInfo was initialized without default delimiter:

Given(~'^this should be converted to a list:(.+)$') { List list ->
    assertEquals(3, list.size())
    assertEquals("Cucumber-JVM", list.get(0))
    assertEquals("Cucumber", list.get(1))
}

The pull request contains the fix and the corresponding test.

[haroon-sheikh]

Looks good to me.

[lock]

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