Unused check of exists constant

[darkdef]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

Merging #74 (8668c7e) into dev (9108b65) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                dev      #74   +/-   ##
=========================================
  Coverage     91.68%   91.68%           
+ Complexity      205      204    -1     
=========================================
  Files            14       14           
  Lines           553      553           
=========================================
  Hits            507      507           
  Misses           46       46           

Impacted Files	Coverage Δ
src/PDO/ConnectionPDOOracle.php	97.22% <100.00%> (ø)

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