View BMI command gives nonsensical data when biometric data is not set

[nus-pe-bot]

The "view bmi" command does not check whether a height has actually been input by the user before performing the calculation for BMI, leading to strange output:

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add weight /1 /1 /12-12-0001
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Weight: 1kg
Fat percentage: 1%
Date: 12-12-0001
 Weight and fat percentage are recorded successfully
-------------------------------------------------------------------------------
view biometrics
-------------------------------------------------------------------------------
Biometrics:
Biometrics are not set
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view bmi
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Your current BMI is : 9.223372036854776E16
Re-check your height and weight inputs. Your BMI is astonishingly high.
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To allay user confusion, it is best to detect this particular case and alert the user accordingly.

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_{[original: nus-cs2113-AY2223S1/pe-interim#1022] [original labels: severity.Low type.FunctionalityBug]}

[gaoyunfan]

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