(#314) Fix NPE on clearParameters

[pan3793]

#314

[codecov]

Codecov Report

Merging #315 (b64ca03) into 2.5 (e87c8ec) will increase coverage by 0.12%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                2.5     #315      +/-   ##
============================================
+ Coverage     59.96%   60.09%   +0.12%     
- Complexity     1190     1195       +5     
============================================
  Files           111      111              
  Lines          5725     5726       +1     
  Branches        453      453              
============================================
+ Hits           3433     3441       +8     
+ Misses         2054     2048       -6     
+ Partials        238      237       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ower/jdbc/statement/AbstractPreparedStatement.java	54.73% <0.00%> (+0.48%)	27.00 <1.00> (+1.00)
...ithub/housepower/jdbc/misc/ClickHouseCityHash.java	86.17% <0.00%> (+4.87%)	22.00% <0.00%> (+3.00%)
...github/housepower/jdbc/ClickHouseSQLException.java	100.00% <0.00%> (+20.00%)	3.00% <0.00%> (+1.00%)

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