[Release 5.0] Fix Null Reference Exception on assigning null to SqlConnectionStringBuilder.Encrypt

[cheenamalhotra]

Ports #1778 to 5.0-servicing.

[codecov]

Codecov Report

Base: 65.47% // Head: 71.79% // Increases project coverage by +6.32% 🎉

Coverage data is based on head (fcd8185) compared to base (914caf5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           5.0-servicing    #1784      +/-   ##
=================================================
+ Coverage          65.47%   71.79%   +6.32%     
=================================================
  Files                293      293              
  Lines              61385    61386       +1     
=================================================
+ Hits               40189    44073    +3884     
+ Misses             21196    17313    -3883     

Flag	Coverage Δ
addons	92.38% <ø> (+92.38%)	⬆️
netcore	75.39% <100.00%> (+6.19%)	⬆️
netfx	69.58% <100.00%> (+5.89%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...osoft/Data/SqlClient/SqlConnectionStringBuilder.cs	88.60% <100.00%> (+0.01%)	⬆️
...re/src/Microsoft/Data/SqlClient/SNI/SNINpHandle.cs	73.77% <0.00%> (-4.92%)	⬇️
.../Microsoft/Data/SqlClient/SNI/SNIMarsConnection.cs	76.72% <0.00%> (-0.63%)	⬇️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	72.88% <0.00%> (+0.19%)	⬆️
...rc/Microsoft/Data/ProviderBase/DbConnectionPool.cs	86.36% <0.00%> (+0.29%)	⬆️
...c/Microsoft/Data/SqlClient/SqlClientEventSource.cs	80.13% <0.00%> (+0.34%)	⬆️
...crosoft/Data/SqlClient/SqlInternalConnectionTds.cs	67.97% <0.00%> (+0.52%)	⬆️
...SqlClient/src/Microsoft/Data/SqlClient/SqlEnums.cs	77.37% <0.00%> (+0.63%)	⬆️
.../Data/SqlClient/SqlClientEventSource.NetCoreApp.cs	100.00% <0.00%> (+0.64%)	⬆️
...SqlClient/src/Microsoft/Data/Common/AdapterUtil.cs	68.38% <0.00%> (+0.82%)	⬆️
... and 54 more

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