Fix STAsBinary returning null for a single point

[peterbae]

Fixes issue #1073.

[codecov-io]

Codecov Report

Merging #1074 into dev will decrease coverage by 0.37%.
The diff coverage is 95.65%.

@@             Coverage Diff              @@
##                dev    #1074      +/-   ##
============================================
- Coverage     53.45%   53.08%   -0.38%     
+ Complexity     3235     3172      -63     
============================================
  Files           119      119              
  Lines         28036    28048      +12     
  Branches       4680     4686       +6     
============================================
- Hits          14988    14889      -99     
- Misses        10904    10937      +33     
- Partials       2144     2222      +78

Impacted Files	Coverage Δ	Complexity Δ
...osoft/sqlserver/jdbc/SQLServerSpatialDatatype.java	85.57% <95.65%> (+0.08%)	294 <20> (+5)	⬆️
...soft/sqlserver/jdbc/SQLServerPooledConnection.java	76.84% <0%> (-4.22%)	26% <0%> (-4%)
...oft/sqlserver/jdbc/SQLServerSymmetricKeyCache.java	56.25% <0%> (-3.75%)	5% <0%> (-3%)
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	43.95% <0%> (-3.3%)	15% <0%> (-1%)
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	53.31% <0%> (-1.87%)	216% <0%> (-32%)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	46.86% <0%> (-1.52%)	111% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerException.java	74.28% <0%> (-1.43%)	33% <0%> (-2%)
...SQLServerColumnEncryptionJavaKeyStoreProvider.java	63.12% <0%> (-1.42%)	10% <0%> (-2%)
...a/com/microsoft/sqlserver/jdbc/PLPInputStream.java	59.76% <0%> (-1.19%)	34% <0%> (-1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	61.03% <0%> (-1.06%)	0% <0%> (ø)
... and 8 more

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