Bds62 baro rounding fix

[JWyman482]

Reference Issue

• Issue "Type Error" #128

Problem(s)

1. The round(baro, 1) call on line 277 in bds62.py was being called when baro was 'None'.
2. (minor) Padding in _print() wasn't sufficient for the baro readout
3. (minor) Output would display units when value was 'None.'

Fix Actions Taken

1. Wrapped the else clause with the round call so it was only called if baro held a numeric value.
2. Updated the output padding from 20 chars to 28 chars
3. Added a conditional to remove the "millibars" if baro is 'None.'