components schema not generated

[dongshengYoung]

Describe the bug

@Operation(summary = "Get chart data", description = "search chart data of target streaming stage and other conditions")
    public HttpResult<ChartDataVo> getProxyChart(@CurrentService PastaService pastaService,
                                                 @Parameter( // open api description
                                                         description = "search conditions",
                                                         schema = @Schema(name = "chartSearchParam",
                                                                 implementation = ChartSearchParam.class)
                                                 ) ChartSearchParam chartSearchParam ) throws ApiException {
method body...
}

when adding schema property, schema not generate correctly

I think it's because empty value of schema

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To Reproduce
Steps to reproduce the behavior:

• spring boot version: 2.2.6.RELEASE
• springdoc-openapi : compile('org.springdoc:springdoc-openapi-ui:1.3.4')

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sample code

public class ChartSearchParam {

    /**
     * timestamp milliseconds
     */
    @Schema(description = "chart data start at, unix timestamp, milliseconds")
    private Long startAt;

    /*    @DateTimeFormat(pattern="yyyy-MM-dd'T'HH:mm:ss.SSSz")
    private ZonedDateTime endAt;*/

    /**
     * timestamp milliseconds
     */
    @Schema(description = "chart data end at, unix timestamp, milliseconds")
    private Long endAt;


    /**
     * what kind of chart data is requested
     */
    @Schema(description = "which streaming stage data is required", implementation = Stage.class)
    private String chartType = "CLIENT_TO_PROXY";

    @Schema(description = "primary key of target stream")
    private Long streamSeq;

}

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Expected behavior

• chartSearchParam shows normal and each field has description