Add null check for delegate parameter in facade constructor

Co-authored-by: laeubi <[email protected]>

Author: Copilot

org.eclipse.m2e.maven.runtime/src/main/java/org/eclipse/m2e/internal/maven/compat/LifecycleExecutionPlanCalculatorFacade.java

@@ -27,6 +27,9 @@ public class LifecycleExecutionPlanCalculatorFacade {
   private final LifecycleExecutionPlanCalculator delegate;
 
   public LifecycleExecutionPlanCalculatorFacade(LifecycleExecutionPlanCalculator delegate) {
+    if(delegate == null) {
+      throw new IllegalArgumentException("delegate cannot be null");
+    }
     this.delegate = delegate;
   }