[SPARK-34152][SQL][FOLLOWUP] Do not uncache the temp view if it doesn't exist #31650
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What changes were proposed in this pull request?
This PR fixes a mistake in #31273. When CREATE OR REPLACE a temp view, we need to uncache the to-be-replaced existing temp view. However, we shouldn't uncache if there is no existing temp view.
This doesn't cause real issues because the uncache action is failure-safe. But it produces a lot of warning messages.
Why are the changes needed?
Avoid unnecessary warning logs.
Does this PR introduce any user-facing change?
no
How was this patch tested?
manually run tests and check the warning messages.