fix has collection cause panic

[weiliu1031]

Signed-off-by: Wei Liu [email protected] issue: #23707

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@weiliu1031 ut workflow job failed, comment rerun ut can trigger the job again.

[xiaofan-luan]

why would it result in panic? it should return false if collection not there as expected?

[weiliu1031]

why would it result in panic? it should return false if collection not there as expected?

cause rootcoord.DescribeCollection will return ErrorCode_UnexpectedError, it will cause handler.HasCollection retry many times and finnally panic

[xiaofan-luan]

why would it result in panic? it should return false if collection not there as expected?

cause rootcoord.DescribeCollection will return ErrorCode_UnexpectedError, it will cause handler.HasCollection retry many times and finnally panic

Fixed that by check unexpectedExcepton