[BCB] Removed VariableCertaintyInIssetRule, replaced by IssetRule

Author: ondrejmirtes

conf/config.level1.neon

@@ -21,13 +21,6 @@ conditionalTags:
 		phpstan.rules.rule: %featureToggles.nullCoalesce%
 
 services:
-	-
-		class: PHPStan\Rules\Variables\VariableCertaintyInIssetRule
-		arguments:
-			bleedingEdge: %featureToggles.bleedingEdge%
-		tags:
-			- phpstan.rules.rule
-
 	-
 		class: PHPStan\Rules\Variables\EmptyRule