Fix invoking WriteError from rule execution threads #497
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Whenever Helper.SuppressRule encounters any error, it invokes Cmdlet.WriteError. When running script rules, SuppressRule is called from rule execution threads. As such, Cmdlet.WriteError gets called from the rule execution threads. This results in an InvalidOperationException because this method can be called only from within BeginProcessing, ProcessRecord and EndProcessing and only within the main program thread.
Fixes #496
This change is