Resolve-NodeProperty does not support $false in DefaultValue parameter

[bdrans]

When specifying $false as the DefaultValue for Resolve-NodeProperty it is treated as if no DefaultValue was passed in. If the specified PropertyPath does not exist instead of $false being returned instead we throw the following error:
"The lookup of path '$PropertyPath' for node '$($node.Name)' returned a Null value, but Null is not specified as Default. This is not allowed."

[cibboy]

The same thing happens when passing in an empty list (@()) as DefaultValue. The issue seems to be on line 59 of file Resolve-NodeProperty.ps1, because it checks the presence of DefaultValue with a simple if (truthy values) instead of checking the presence of the key in the $PSBoundParameters dictionary. I think line 59 should be elseif ($PSBoundParameters.ContainsKey('DefaultValue')), but it depends on the original thought process for the implementation. @gaelcolas, @raandree any thoughts?