Fix exception thrown by getters on null columns

[AfsanehR-zz]

No description provided.

[codecov-io]

Codecov Report

Merging #488 into dev will decrease coverage by 0.09%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##                dev     #488     +/-   ##
===========================================
- Coverage     46.37%   46.27%   -0.1%     
+ Complexity     2212     2205      -7     
===========================================
  Files           108      108             
  Lines         25231    25231             
  Branches       4173     4173             
===========================================
- Hits          11700    11676     -24     
- Misses        11524    11528      +4     
- Partials       2007     2027     +20

Flag	Coverage Δ	Complexity Δ
#JDBC41	46.04% <100%> (-0.2%)	2190 <0> (-12)
#JDBC42	46.11% <100%> (-0.16%)	2200 <0> (-8)

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	62.99% <100%> (-0.19%)	0 <0> (ø)
...a/com/microsoft/sqlserver/jdbc/PLPInputStream.java	53.01% <0%> (-2.41%)	29% <0%> (-2%)
...n/java/com/microsoft/sqlserver/jdbc/Parameter.java	61.8% <0%> (-0.65%)	63% <0%> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	32.77% <0%> (-0.57%)	241% <0%> (-5%)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	59.17% <0%> (-0.44%)	88% <0%> (-1%)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	42.2% <0%> (-0.22%)	46% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.51% <0%> (-0.2%)	239% <0%> (+1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	53.78% <0%> (+0.2%)	0% <0%> (ø)	⬇️

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