rpc: use nil topic wildcards instead of ""
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@ -1061,7 +1061,7 @@ func (args *WhisperFilterArgs) UnmarshalJSON(b []byte) (err error) {
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for idx, field := range list {
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switch value := field.(type) {
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case nil:
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topics[idx] = []string{""}
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topics[idx] = []string{}
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case string:
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topics[idx] = []string{value}
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