fix hasThisParameter to check for parameters length
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@ -139,7 +139,7 @@ namespace ts.refactor.convertToNamedParameters {
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}
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function hasThisParameter(parameters: NodeArray<ParameterDeclaration>): boolean {
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return isThis(parameters[0].name);
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return parameters.length > 0 && isThis(parameters[0].name);
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}
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function getRefactorableParametersLength(parameters: NodeArray<ParameterDeclaration>): number {
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