Fixed potential NullPointerException in logException()

[ulvii]

An Exception may have a null error message.

[codecov-io]

Codecov Report

Merging #844 into dev will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #844      +/-   ##
============================================
- Coverage     48.29%   48.27%   -0.02%     
+ Complexity     2781     2780       -1     
============================================
  Files           116      116              
  Lines         27877    27877              
  Branches       4651     4651              
============================================
- Hits          13462    13458       -4     
- Misses        12200    12203       +3     
- Partials       2215     2216       +1

Flag	Coverage Δ	Complexity Δ
#JDBC42	47.78% <100%> (-0.03%)	2736 <0> (-4)
#JDBC43	48.2% <100%> (-0.03%)	2776 <0> (-3)

Impacted Files	Coverage Δ	Complexity Δ
...m/microsoft/sqlserver/jdbc/SQLServerException.java	77.44% <100%> (ø)	31 <0> (ø)	⬇️
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	43.95% <0%> (-3.3%)	15% <0%> (ø)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	60.99% <0%> (-0.44%)	89% <0%> (-1%)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	32.46% <0%> (-0.31%)	253% <0%> (-3%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	54.48% <0%> (-0.07%)	0% <0%> (ø)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	44.2% <0%> (ø)	107% <0%> (+1%)	⬆️
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.46% <0%> (+0.12%)	262% <0%> (+1%)	⬆️
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	62.28% <0%> (+0.29%)	0% <0%> (ø)	⬇️
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	39% <0%> (+0.86%)	43% <0%> (+1%)	⬆️

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