Log find command does not work for numeric input in workout name

[nus-pe-bot]

No console alert was displayed when entering that command.

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_{[original: nus-cs2103-AY1920S2/pe-interim#1199]}

[alloystory]

Team's Response

possibly a duplicate of #740. reassigned this a severity of medium as it is likely that a user uses this command frequently and face this issue.

Duplicate status (if any):

Duplicate of #740