Fix default Data-value in Invoke-File

[fflaten]

PR Summary

Using ParameterAttribute or CmdLetBinding in a parameterized testfile causes ParameterBindingException for a $null-value when invoked without providing any parameter-values. $Data-parameter is default null in Invoke-File, but is always passed to the scriptblock. This throws the error since advanced functions (testfile) don't implicitly allow arguments.

PR changes $Data to be empty hashtable by default as splatting the empty hashtable will avoid the error while not affecting the script/testfile. Similar to #1730 for Mocks and #1812 for InModuleScope.

Fix #1851

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