Validator.isValid() now throws an exception for null

[eeverman]

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Fixes #361

[codecov[bot]]

Codecov Report

Merging #706 (9fe631b) into main (21b2f21) will decrease coverage by 0.10%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #706      +/-   ##
============================================
- Coverage     88.04%   87.93%   -0.11%     
- Complexity     1184     1187       +3     
============================================
  Files           133      133              
  Lines          3738     3697      -41     
  Branches        463      442      -21     
============================================
- Hits           3291     3251      -40     
- Misses          320      322       +2     
+ Partials        127      124       -3     

Impacted Files	Coverage Δ
...va/org/yarnandtail/andhow/valid/BaseValidator.java	100.00% <100.00%> (ø)
.../org/yarnandtail/andhow/valid/BigDecValidator.java	100.00% <100.00%> (ø)
...ava/org/yarnandtail/andhow/valid/DblValidator.java	100.00% <100.00%> (ø)
...ava/org/yarnandtail/andhow/valid/IntValidator.java	100.00% <100.00%> (ø)
...ava/org/yarnandtail/andhow/valid/LngValidator.java	100.00% <100.00%> (ø)
...rnandtail/andhow/valid/LocalDateTimeValidator.java	100.00% <100.00%> (ø)
.../org/yarnandtail/andhow/valid/StringValidator.java	100.00% <100.00%> (+1.75%)	:arrow_up:
...org/yarnandtail/andhow/load/std/StdJndiLoader.java	81.81% <0.00%> (-3.90%)	:arrow_down:
...ava/org/yarnandtail/andhow/AndHowTestBaseImpl.java	100.00% <0.00%> (+3.70%)	:arrow_up:

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[eeverman]

CodeCov continues to perplex. Files not at all related to this change show a decrease...