find-assignment doesn't clear right panel despite no assignment found

[nus-pe-bot]

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_{[original: nus-cs2103-AY1920S2/pe-interim#2472]}

[ivanteejj]

Team's Response

Issue is not relevant for all cases. It is not needed to clear the selected panel when finding assignments. For example, I might still want the information of the assignment to input different keywords and find assignments again, even though no assignments were found.

Duplicate status (if any):

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