RFR 8224114: Implement Scope.noFilter instead of using a null reference

[Ron Shapiro]

I found another location where a null symbol filter is being passed from
Resolve.java - please hold off on accepting this change until I do a little
bit more searching to find potentially other locations.

On Fri, May 17, 2019 at 10:46 AM Vicente Romero <vicente.romero at oracle.com>
wrote:

> looks good,
> Vicente
>
> On 5/17/19 10:24 AM, Ron Shapiro wrote:
>
> Please review this small refactoring to implement Scope.noFilter instead
> of maintaining several null checks throughout the code.
>
> bug: https://bugs.openjdk.java.net/browse/JDK-8224114
> webrev: http://cr.openjdk.java.net/~ronsh/8224114/webrev.00/
>
>
>
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