[5.1.1] Fix | NullReferenceException in GetBytesAsync

[lcheunglci]

Backporting the fix to the NullReferenceException into the 5.1-servicing branch and these changes were based on #1906

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.51 ⚠️

Comparison is base (0156df2) 70.83% compared to head (faad6e7) 70.33%.

Additional details and impacted files

@@                Coverage Diff                @@
##           5.1-servicing    #1964      +/-   ##
=================================================
- Coverage          70.83%   70.33%   -0.51%     
=================================================
  Files                292      292              
  Lines              61732    61732              
=================================================
- Hits               43730    43419     -311     
- Misses             18002    18313     +311     

Flag	Coverage Δ
addons	92.38% <ø> (ø)
netcore	73.63% <100.00%> (-0.68%)	⬇️
netfx	69.03% <ø> (-0.17%)	⬇️

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Impacted Files	Coverage Δ
...core/src/Microsoft/Data/SqlClient/SqlDataReader.cs	72.88% <100.00%> (-0.46%)	⬇️

... and 24 files with indirect coverage changes

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